"Although the skull and skeleton of Au. sediba do evince derived features shared with early Homo, the overall body plan is that of a hominin at an australopith adaptive grade." — Lee Berger and colleagues, describing the species they named, Science, 20101
"A complete adult skull might support placing Au. sediba outside of the human holobaramin." — Todd Wood and Peter Brummel, Proceedings of the Ninth International Conference on Creationism, 20232
Summary
Two partial skeletons of Australopithecus sediba were found in Malapa Cave, South Africa, in 2008. Matthew Berger, the son of the paleoanthropologist Lee Berger, found the first bone, a collarbone, on 15 August 2008.13 The skeletons are MH1, a juvenile male, and MH2, an adult female. The cave holds the bones of at least six hominins and of animals that fell down a shaft into a dark chamber and were buried there, many with their joints still together.44 On the standard dates the skeletons are about 1.98 million years old.5
The anatomy is a mixture, and the mixture is real. The brain was about 420 cubic centimetres, the same size as other australopiths' and less than half the Homo erectus average.1 The adults weighed about 30 to 36 kilograms.6 The shoulders and arms were built for climbing,7 the upper chest was narrow like an ape's,8 and the heel was ape-like.9 But the cheek teeth were small,10 the thumb was long and the fingers short,11 the hip blades were turned more like those of Homo,12 and the lower back had the human count of five lumbar vertebrae.13 The discoverers themselves called the whole body "an australopith adaptive grade."1
Berger's team proposed sediba as a candidate ancestor of Homo. Many specialists doubt it, for two reasons. First, it is too young: a jaw from Ledi-Geraru in Ethiopia, assigned to Homo, is about 2.8 million years old, some 800,000 years older than Malapa.14 Du and Alemseged calculated that, if sediba really were the ancestor, the chance of finding it that much later than its descendant is about 0.09 percent.15 Second, the most Homo-like skull is a child's, and William Kimbel and Yoel Rak argue that its human-looking face is partly the face of a juvenile.16 Neither argument is final, and the article says why.
Young-earth writers disagree about which side of the human line sediba falls on. Most call it an ape: Peter Line, Marvin Lubenow, David Menton, Anne Habermehl, David DeWitt, Jean O'Micks, and Brian Thomas in 2010 and 2011. Todd Wood's statistical baraminology, creationism's own method for sorting created kinds, put it with humans in 2010, and the result held when the method was changed and when a second set of skull and tooth characters was used.1718 But Wood's own analyses of the rest of the skeleton, in 2013 and 2023, did not put sediba with humans, and in 2023 Wood and Peter Brummel wrote that "a mature Au. sediba skull is likely needed to resolve these questions."192 Christopher Rupe and John Sanford argued in 2017 that the skeletons are a jumble of human and ape bones.20 The excavation record does not support that claim.
Verdict. The anatomy says sediba was not human. The skull and teeth lean toward Homo, but the brain, body size, arms, shoulders, upper chest and heel are those of an australopith, and the most Homo-like skull is a child's. So the young-earth majority, which calls sediba an ape, agrees with the mainstream classification. Wood's human placement is the weaker reading, and his own skeleton data no longer support it. As an ancestor of Homo, sediba is unlikely on the standard dates. Every young-earth placement carries the same unpaid cost: the Malapa deposit is dated by two methods that agree, and a young-earth age is about 365 to 440 times younger than they allow.21
Part 1: The finds
Malapa Cave, 2008
Malapa is a cave in dolomite rock 15 kilometres north-northeast of Sterkfontein, in the area of South Africa called the Cradle of Humankind.22 Berger found the site on 1 August 2008 while surveying for new fossil caves.3 Lime miners had blasted into it in the late nineteenth or early twentieth century and left blocks of cave fill lying around the pit.3 When Berger went back on 15 August, his son Matthew found the first hominin bones.3 It belonged to the skeleton now called MH1, for Malapa Hominin 1.1
Two partial skeletons came out of the first excavations. MH1 is a juvenile with a nearly complete skull, and it is the type specimen of the species. MH2 is an adult, represented by teeth, part of a lower jaw and much of the skeleton below the neck.1 Berger found MH2 on 4 September 2008, still in place in the hardened sediment of the pit, which also showed where MH1 had lain.3 When the block holding MH2 was prepared, it contained a partly articulated arm with most of the right shoulder blade, half the right collarbone, parts of the chest and bones of the leg.3 The pelvis of MH2 has female features and that of MH1 male ones.10 MH1's age at death was "12 to 13 years by human standards," judged from its teeth and growth plates.1 Measured against a chimpanzee's pattern of growth, which may suit an australopith better, the same evidence gives 9 to 11 years.10 MH1's second molars had already come in, so its brain had probably reached at least 95 percent of adult size.1
There is more than two skeletons' worth of material, but most of what has been studied comes from these two. The 2018 inventory counts 135 separate elements "representing a minimum of three individuals."23 The taphonomic study of the whole deposit counts at least six hominins among 242 identified hominin specimens.4 Williams and colleagues wrote in 2018 that "additional individuals await excavation/preparation."23
How the bones got there
The animals of Malapa fell into a dark chamber that scavengers could not reach, and many were buried whole. Aurore Val and colleagues studied every identified bone in the deposit in 2015. Eighteen kinds of animal are present: hoofed animals, carnivores, rodents, birds, a baboon skull and the hominins. They found complete and articulated skeletons, matching left and right bones, and no bones gnawed by carnivores. They concluded that "animals accumulated via a natural death trap leading to an area of the cave system with no access to mammalian scavengers."4 They proposed "that at least seven complete individuals, including the two hominins MH1 and MH2 (Table 1), accumulated inside a cave chamber where they decomposed and mummified."4 A flow of water and mud then carried the bodies a short way and buried them, and the sediment hardened soon after.22
The deposit is not perfectly clean. Val's team also found brown hyaena milk teeth, carnivore dung and badly broken, weathered bone, which they explain as sediment from other chambers washed down by periodic water flow.4 That mixing is the grain of truth in the young-earth claim, discussed in Part 6, that the skeletons are a mixture. But the hominin skeletons themselves were found with "joints found in articulation or in close anatomical proximity, with all recovered parts showing a low degree of post-mortem dispersion."10 That last description comes from the discovery team.
The papers
The material has been described in a long run of papers, most of them by the discovery team. The species was named in Science in April 2010, with a companion paper on the geology and age.122 A second set in Science in September 2011 described the brain cast, the pelvis, the hand, the foot and a refined date.24121195 A third set in April 2013 described the teeth, the lower jaws, the arms, the rib cage, the spine and the leg.2526781327 A special issue of PaleoAnthropology in 2018 gave full descriptions of most of the skeleton,23 and in 2021 the team described new lower-back vertebrae that fit MH2.28 Critics' work is covered in Part 4.
Part 2: What the anatomy shows
Every part of the skeleton that has been described shows a mix of australopith and Homo features, but the mix is uneven. The skull, teeth, hand and hip carry most of the Homo-like traits. The brain, the body size, the shoulder and arm, the upper chest and the heel are australopith or ape-like. The table at the end of this part lists them region by region. Most of the descriptions come from the discovery team, and many of the Science papers could be read only in their abstracts, so the detail below is thinner than the subject deserves.
Brain
MH1's brain held at least 420 cubic centimetres.1 Because MH1's second molars had come in, the team judged that it had reached at least 95 percent of adult brain size,1 so an adult would have been about 440 cc at most.29 The discoverers' own comparison table gives species averages of 415 cc for A. afarensis, 442 for A. africanus, 631 for Homo habilis, 751 for H. rudolfensis and 900 for H. erectus.1 Adult chimpanzees average 369.30 So sediba's brain was an australopith's brain in size. The cast of the inside of MH1's skull shows "generally australopith-like convolutional patterns on the frontal lobes but also some foreshadowing of features of the human frontal lobes, such as posterior repositioning of the olfactory bulbs."24
Body size
The adults weighed about as much as a small australopith. Trenton Holliday and colleagues estimated body mass from the size of the hip joint and found that "all three Au. sediba individuals had body masses between ca. 30-36 kg," which puts them among the smaller A. afarensis and A. africanus "and well below the size range of specimens attributed to early Homo."6 No height estimate was found in the papers read for this article.
Skull, jaw and teeth
This is where most of the Homo-like traits are. Berger's team listed the features that keep the species in Australopithecus: "small cranial capacity, pronounced glabelar region, patent premaxillary suture" and several more.1 But Todd Wood counted the states in the team's own character list and found that sediba shares 51 of 69 with H. erectus and only 33 with A. africanus.31 The teeth are small. Joel Irish and colleagues found that the teeth "present a mosaic of primitive and derived features" and that sediba "links with Au. africanus to form a South African australopith clade."25 The key caveat for the skull is that the only skull is a child's; Part 4 returns to it.
Shoulder, arm and hand
The arm was built for climbing, the hand for both climbing and fine gripping. Steven Churchill and colleagues wrote that the upper limbs, "excluding the hand and wrist," are "predominantly primitive and suggest the retention of substantial climbing and suspensory ability."7 MH2's hand "presents a suite of Australopithecus-like features, such as a strong flexor apparatus associated with arboreal locomotion, and Homo-like features, such as a long thumb and short fingers associated with precision gripping and possibly stone tool production."11
Chest and spine
The upper chest was ape-like, the lower chest and lower back more human. The ribs "exhibit a mediolaterally narrow, ape-like upper thoracic shape," while "the lower thorax, however, appears less laterally flared than that of apes and more closely approximates the morphology found in humans."8 The spine probably had "five non-rib-bearing lumbar vertebrae and five sacral elements, the same configuration that occurs modally in modern humans."13 The 2021 paper on MH2's newly found lumbar vertebrae concluded that MH2 "possessed a lower back consistent with lumbar lordosis," the inward curve of the lower back that goes with upright walking.28 The same paper notes that published readings of that curve "range from hyperlordotic to hypolordotic," that is, from too curved to too straight.28
Hip, leg and foot
The hip has the strongest Homo-like features below the neck. Job Kibii and colleagues found features shared with australopiths, "such as large biacetabular diameter, small sacral and coxal joints, and long pubic rami," and features shared with Homo, "including more vertically oriented and sigmoid-shaped iliac blades."12 Both MH1 and MH2 have the more upright hip blade.10 The ankle joint is "mostly humanlike in form and inferred function," but the heel bone is ape-like: "Au. sediba is apelike in possessing a more gracile calcaneal body and a more robust medial malleolus than expected."9 Jeremy DeSilva and colleagues reconstructed an odd walk from these joints, with the foot rolling hard inward at each step, which they call "hyperpronation." It is a reconstruction from joint shapes, not an observation.27 Holliday's team add that "the lower limb does not appear to be as elongated as that of early Homo, suggesting that long-distance terrestrial bipedality was not a regular part of the species' behavioral repertoire."6
The traits side by side
| Region | Australopith-like or ape-like | Homo-like | Main sources |
|---|---|---|---|
| Brain | about 420 cc, australopith range; frontal lobes "generally australopith-like" | olfactory bulbs set further back | Berger 2010; Carlson 2011 |
| Body | about 30 to 36 kg | none | Holliday 2018 |
| Skull and face | small braincase, prominent brow area | 51 of 69 character states shared with H. erectus; face less projecting | Berger 2010; Wood 2011 |
| Teeth | grouped with A. africanus | small cheek teeth | Irish 2013; Berger 2010 |
| Shoulder and arm | "predominantly primitive," climbing and hanging | none | Churchill 2013 |
| Hand | strong finger flexors for climbing | long thumb, short fingers | Kivell 2011 |
| Upper chest | narrow, ape-like | none | Schmid 2013 |
| Lower chest and back | none | lower chest less flared; five lumbar vertebrae; lordosis | Schmid 2013; Williams 2013, 2021 |
| Hip | wide hip joints, small joints with the sacrum, long pubic bones | upright, S-shaped hip blades; short ischium | Kibii 2011; Berger 2010 |
| Leg and foot | ape-like heel; leg not lengthened like early Homo | human-like ankle joint, some arch | Zipfel 2011; Holliday 2018 |
The discoverers' own summary is the fairest one. "Although the skull and skeleton of Au. sediba do evince derived features shared with early Homo, the overall body plan is that of a hominin at an australopith adaptive grade."1 Zipfel's team drew the general lesson for the foot: "homoplasy is implied in the acquisition of bipedal adaptations in the hominin foot,"9 which means that some human-like walking features arose more than once. The young-earth reading of that admission is taken up in the objections.
Part 3: How old is it?
How Malapa was dated
On the standard dating methods, Malapa is one of the best-dated hominin sites in Africa, and the fossils are about 1.98 million years old. The age rests on three kinds of evidence. The South African caves have no volcanic ash, so none of them is the argon dating used in East Africa. How these methods work is explained in The South African Australopiths, Part 4.
- Fossil animals. Several species in the deposit first appear in Africa about 2.36 million years ago, and an extinct cat found with them, Megantereon whitei, last appears about 1.5 million years ago. "These ages thus bracket the depositional age of the fossil hominins."22
- Uranium-lead dating of flowstone. A sheet of cave calcite lies 20 centimetres below the adult skeleton. Two laboratories, in Bern and Melbourne, dated it separately at 2.024 ± 0.062 and 2.026 ± 0.021 million years. Since the fossils lie above it, that is their maximum age.22 In 2011 a second flowstone, lying over the fossil-bearing sediment in a newly exposed pit, was dated at about 2.0 million years, give or take 0.14 million. That is a minimum.5
- The magnetism of the sediments. The fossil-bearing sediment records a normal magnetic field, like today's, and both flowstones record mainly a reversed one.225 The magnetic record supplies the precise date.
The headline date of 1.977 million years comes from the magnetic step, not from a radioactive clock. In 2010 the team matched the normal polarity of the sediments to the Olduvai Subchron, a long normal-field interval from 1.95 to 1.78 million years ago, and dated the fossils to that window.22 The capping flowstone, dated in 2011, ruled that out: a reversed flowstone of about 2.0 million years lying above the fossils means the normal interval below it must be older than 1.95. Between the base flowstone and the Olduvai, only one short normal interval is known, the "pre-Olduvai excursion." It was previously known only from deep-sea cores in the North Atlantic, and it is thought to have lasted about 3,000 years. Robyn Pickering and colleagues therefore placed the fossils inside it, at "1.977 ±0.002 Ma."5 The team's own supplement warns of "the potential for misinterpretation of polarities to the wrong Chron or Sub-Chron," as had happened in their own 2010 paper.5
How firm is the date on its own terms?
The age of about 2 million years is firm. The precision of plus or minus 2,000 years is not, and the only young-earth critique of the dating is right about that much. The fossils lie above a flowstone dated to about 2.03 million years by two laboratories and below one dated to about 2.0 million. The animals bracket them between 2.36 and 1.5 million. The Cradle-wide flowstone study of 2019 puts the accumulation of Malapa's sediments in an interval between 1.82 and 2.00 million years.32 None of these needs the magnetic match. But the ±0.002 figure depends on the polarity being the pre-Olduvai excursion, on that excursion's age in the ocean cores, and on the sediment having been laid down within its roughly 3,000 years. The capping flowstone's own date has a 7 percent error, and the scatter of its data points was "considerable," with an MSWD of 606.5 The supplement also gives two different numbers for that flowstone, 1.975 ± 0.142 in the text and 2.048 ± 0.140 in the data table.5 So the defensible statement is "about 2.0 million years, probably close to 1.98," not "1.977 ± 0.002."
The young-earth critique came from Answers in Genesis in 2011. David Menton, Andrew Snelling and Elizabeth Mitchell argued that Berger's team had set "a reachable age goal" and that "the fossils needed to be re-dated to conform to expectations." They noted that the capping flowstone was in a different pit, four metres away, and that its data had an MSWD of 606, which they said "the 'textbooks' teach, would automatically disqualify the data from providing any valid age information." They concluded that "the whole process is quite circular, producing an attractive 'precise' date of completely unknown accuracy."33 Peter Line of Creation Ministries International repeated that last sentence in 2011.34
Part of that critique holds and part does not. It is right that the precise figure is an inference from a magnetic match, and right about the scatter. It is wrong about the source of the date. The authors wrote that "the date was obtained by comparison to the Huckleberry Ridge Tuff, which was itself dated using argon-argon dating."33 The supplement ties the fossils to the pre-Olduvai excursion instead; the Huckleberry Ridge event is the older normal interval matched to the base of the lower flowstone.5 And the uranium-lead dates on the flowstones use no argon standards at all, so the charge of circularity does not reach the bracket from about 2.03 to about 1.8 million years. Nor did the re-dating serve the ancestry claim well. It moved the fossils between 27,000 and 197,000 years older, inside a bracket the 2010 uranium-lead maximum already allowed, and they remain at least 800,000 years younger than the oldest jaw now assigned to Homo.14
What a young-earth reading must explain
Young-earth writers who place the South African caves put their fill after Noah's Flood, and Malapa cannot be earlier. The cave is dissolved out of dolomite that the team assigns to the late Archaean, "2.64 to 2.50 billion years ago."22 On any young-earth geology that rock was laid down and hardened long before the end of the Flood, and the cave formed in it afterward. If sediba is human, as Wood holds, it must be later still. Wood's 2010 paper has the human groups spread out from Babel and says that "any model of post-Babel distribution must account for" their order in the rocks.17 David DeWitt drew the consequence for Malapa: a human sediba in South Africa would be "a descendant of Noah that made it quite some distance from anyone's suggested location for the Tower of Babel."35
So the uranium in the Malapa flowstones must have decayed about 365 to 440 times faster than it does now, after the Flood, while animals fell into the cave.21 The young-earth physicists who argue for faster decay in the past place it in Creation Week and the Flood year, not later. The cost of that position, and the cave history it also requires, is set out in The South African Australopiths, Part 5, which applies to Malapa without change. No young-earth writer found for this article has proposed a post-Flood age for Malapa or explained its flowstone dates.
Part 4: Was it the ancestor of Homo?
Berger's claim
Berger's team proposed sediba as a possible ancestor of our genus, but carefully. In 2010 they wrote that the species "shares more derived features with early Homo than does any other known australopith species (Table 1 and table S2) and thus represents a candidate ancestor for the genus, or a sister group to a close ancestor that persisted for some time after the first appearance of Homo."1 They saw the timing problem at once: an ancestor younger than 1.95 million years "is seemingly at odds with the recovery of older fossils attributed to the latter genus."1 In 2012 Berger went further. He called sediba "a strong potential candidate ancestor of the genus Homo" and "perhaps the best candidate," and he answered the timing objection in two ways. The older Homo fossils, he argued, are poor and of "questionable provenance," and "Malapa is almost certainly not the first chronological appearance of Au. sediba, it is only the first known fossil occurrence."3
The timing problem
Since 2015 the oldest fossil assigned to Homo has been about 800,000 years older than Malapa. LD 350-1 is half a lower jaw from Ledi-Geraru in Ethiopia. Brian Villmoare and colleagues described it as combining "derived morphology observed in later Homo with primitive traits seen in early Australopithecus," and dated it to 2.80 to 2.75 million years.14 The date is not taken from the jaw itself. The jaw was found on the surface of silts 10 metres above a volcanic ash dated to 2.842 million years, and its age was worked out from the rate at which those silts built up.14 Berger's group disputed that the jaw is Homo at all; they said the comparisons with sediba in the paper were wrong, and that "specimen LD 350-1 cannot be unequivocally assigned to the genus Homo." Villmoare's team replied that the jaw "falls outside of the pattern that A. sediba shares with Australopithecus and thus is reasonably assigned to the genus Homo."3637 Even without LD 350-1, a Hadar upper jaw, A.L. 666-1, was attributed to "Homo aff. H. habilis" in 1997 and dated to 2.33 million years.38
Andy Du and Zeresenay Alemseged put a number on the problem in 2019. If sediba gave rise to Homo, the two species must have overlapped in time, and the one sediba site must happen to sample the very end of a long range. They modelled how often that happens and found that "observing an ancestor's fossil horizon that is at least 800,000 years younger than the descendant's fossil horizon is unlikely (about 0.09% on average)."15 When they moved the first Homo forward to A.L. 666-1 at 2.33 million years, or doubled the assumed length of a species' life to 2 million years, the probabilities stayed small: "the mean and maximum P values over all possible overlap values are only 0.04 and 0.20."15 The model assumes that both species lasted about 0.97 million years and that fossils were equally likely to be preserved at any time in a species' range.15
The other side has a fair reply. Chris Robinson and colleagues, who supplied that 0.97-million-year average, argued in 2018 that a species known from a single site could have begun as early as 2.95 million years ago, which would put it before LD 350-1, and concluded that "we cannot refute the hypothesis that the species A. sediba is ancestral to our genus based solely on currently available temporal data."39 A Bayesian analysis by Mana Dembo and colleagues in 2015 found that the best-supported tree puts sediba as the sister of all Homo. It drew the consequence plainly: "the Au. sediba lineage must be at least 300 000-500 000 years older than the current hypodigm suggests, and may be as much as 800 000 years older."40 That is the "ghost lineage" Kimbel and Rak call "unwarranted": hundreds of thousands of years of sediba ancestors that have left no fossil.16
The child's skull
The most Homo-like part of sediba is the skull of a child, and children of many primates look more human than their parents. William Kimbel and Yoel Rak compared MH1 with growth series of chimpanzee, gorilla and human skulls and "found that key aspects of MH 1's resemblance to Homo can be accounted for by its immaturity." They also found features MH1 shares with the Sterkfontein australopiths and argued that sediba "was uniquely related to A. africanus."16 The dental study of 2013 reached a similar grouping: sediba "links with Au. africanus to form a South African australopith clade."25 Carrie Mongle, David Strait and Frederick Grine tested the juvenile explanation in 2023 and "could not reject the hypothesis that A. sediba shares its closest phylogenetic affinities with the genus Homo." Their conclusion was modest: sediba "is plausibly the terminal end of a lineage that shared a common ancestor with the earliest representatives of Homo." They added that an adult skull "may ultimately necessitate a re-evaluation."41
One species or two?
One team argues that MH1 and MH2 belong to two different genera. Yoel Rak and colleagues traced the outline of the jaw's rising branch in 2021 and wrote that "the specimens represent two separate genera: Australopithecus and Homo."42 Their method classified MH1 as Australopithecus with a probability of 1.00 and placed MH2 in a "generalised" group, as "most likely an orangutan," with a probability of 0.76.42 Terrence Ritzman and colleagues had already compared the same jaw shapes against apes and humans in 2016 and concluded "that MH1 and MH2 represent a single species."43 Hawks and Berger answered Rak in 2022. They pointed out that Rak used five fossil jaws for all of Homo, and showed the same pair of jaw shapes inside single samples of Homo from Algeria and from Spain's Sima de los Huesos.10 They also listed the features that tie the two skeletons together from head to foot: the heel, the hip, the thigh bone, the small molars, and tooth enamel with "near-identical enamel carbon-13 values."10 Peter Line, who reported the dispute for young-earth readers, sided with Hawks and Berger on this point: "The apparent widespread variation of ramus features in mandibles appears to make them unsuitable as a taxonomic diagnostic tool on their own."44
Verdict on ancestry
On the standard dates, sediba is unlikely to be the ancestor of Homo. It is younger than the oldest jaw assigned to Homo by about 800,000 years, and its most Homo-like skull is a child's. The best case for it, Dembo's tree, makes it a side branch whose lineage must reach back far beyond Malapa. The more economical reading is the one Kimbel and Rak give: a late South African australopith, related to A. africanus, which evolved some Homo-like features on its own. The question stays open in the mainstream literature because the earliest Homo fossils are scrappy and the sediba adults lack a skull. But every position in that dispute lies between about 2 and 3 million years. None is a step toward a young earth.
Part 5: Where young-earth writers put it
Young-earth writers have given three answers: an ape, a human, or a mixture of the two. The disagreement began within weeks of the 2010 description and has not ended. The general question of how creationists sort hominin fossils, and whether their methods agree, belongs to Ape or Human? How Creationists Sort the Fossils. This part gives the sediba case.
2010: an ape, says nearly everyone; human, says Wood
The first reactions all called it an ape. Peter Line of Creation Ministries International suggested in April 2010 that the dispute "may well be resolved if Australopithecus sediba is a small-brained specimen of the type evolutionists have often classified as Homo habilis," a name he regarded as a wastebasket for australopiths.45 Brian Thomas of the Institute for Creation Research called the fossils "the remains of this extinct ape," which "provide several solid clues that contradict any evolutionary relationship to man."46
Then Todd Wood, the leading practitioner of statistical baraminology, put it with humans. Baraminology is the young-earth attempt to find the boundaries of the created kinds. Wood's version measures how similar each pair of species is across a list of anatomical characters and looks for groups whose members resemble each other and differ from everything outside. His paper in Answers Research Journal, published on 5 May 2010, ran this on eight published sets of skull and tooth characters. The set from Berger's own paper had 69 characters for ten fossil species.17 The result was that "Homo habilis, Homo rudolfensis, and—most surprisingly—Australopithecus sediba belong in the human holobaramin," the created human kind.17 Sediba "was positively correlated with all Homo species (with bootstrap values >90%) and did not positively correlate with any australopiths," and Wood concluded that "it seems more appropriate to refer sediba to genus Homo."17 He expected the backlash. He wrote that "given sediba's extremely ape-like forearms (Berger et al. 2010), it seems likely that many creationists would prefer to place sediba among the australopiths."17 He also listed the weaknesses himself: every data set was skulls and teeth only, and "It is possible that inclusion of postcranial characters in future baraminological analyses might support the separation of H. habilis and 'Au.' sediba from the human holobaramin."17
The replies were quick and hostile. Line answered in June that Wood's result did not "warrant sweeping conclusions that effectively extend the range of human variation to apish creatures swinging in trees like Tarzan."47 Marvin Lubenow, author of Bones of Contention, wrote for Answers in Genesis in August that "it and Australopithecus africanus are both extinct varieties of the original Genesis ape kind."48 Wood's blog reply was dry: "Since I don't think sediba is an ape, I must not be a biblical creationist."49 Later that month Answers Research Journal printed three separately signed responses. David Menton wrote, "I do not agree that it is human, and neither do most evolutionists."35 Anne Habermehl called sediba one of "these obvious apes."35 David DeWitt wrote, "Regardless of the bootstrap BDIST calculations, sediba should not be considered a human," and called the result "a false positive."35 Wood counted the critics and observed that "all five of the sediba critics are absolutely, positively convinced that it isn't human."50
2011 to 2016: the case is tested and wobbles
Wood defended the result in 2011 but admitted it hung on one data set. He argued that no theological objection works: "If A. sediba descended from Adam, then he is human not animal. Likewise, australopiths like africanus or afarensis are animals."31 He told his critics that "they ought to do their own statistical analysis."31 But he conceded that the placement, "though strongly supported by the data used in my study, is only supported by one character set," and that his preliminary results with bones below the skull were "inconclusive."3131
In 2013 Wood ran that test and it did not support him. He analysed the 78 postcranial characters of the 2010 description and 25 hand characters from the 2011 hand paper. "No analysis of the postcranial characters of Berger, et al. (2010) or Kivell, et al. (2011) revealed any strong affinity between A. sediba and H. sapiens or H. erectus."19 He would not call that a refutation, because the small number of species made the method weak: "failure to corroborate a previous result is not the same as falsifying that result."19 But he added, "Turning back to basic anatomical and biological considerations, we still find reasons to doubt the humanity of A. sediba," pointing to the australopith-like frontal lobes and to signs of tree bark in the diet.19 In 2016 a second, larger skull-and-tooth data set kept sediba correlated with Homo, though now "more of an outlier."51
The ape camp did not move. Line wrote in 2011 that sediba "is not an apeman or missing link but likely to be another variety of australopithecine."34 Thomas called it "an extinct ape kind."52 Jean O'Micks, adding postcranial characters to his own analysis of Homo naledi in 2016, concluded that naledi and sediba "might be similar, if not the same species of australopithecine."53 His brain-to-body clustering of 2017 put sediba in the non-human group.54
2017 to 2022: the mixture claim
In 2017 Christopher Rupe and John Sanford offered a third answer: sediba is not a species at all. In Contested Bones they wrote, "What Berger and colleagues reconstructed is not a new species but rather appears to be a chimeric skeleton (a mixture of human and non-human bones)."20 They assigned the human-looking hip, hand and lower chest to Homo, and the skull, shoulder and arm to Australopithecus: "the human-looking hip appears to have been mistakenly combined with australopith bones," while "the upper limb bones attributed to Sediba are unmistakably ape-like."2020 The Institute for Creation Research adopted this view. In 2022 Thomas wrote that "Australopithecus sediba wasn't a real creature. It's just a mixture of human and ape bones that never belonged together," and that enough had been published "to reveal sediba as just a mixture of bones from different creatures."55 That reversed the institute's own 2010 and 2011 position that sediba was one extinct ape.
A creationist reviewer challenged the mixture claim at once. Ronny Nalin of the Geoscience Research Institute, reviewing Contested Bones, quoted the excavation reports: MH2's "right wrist and hand were uncovered in a cluster and in close association with the remainder of the right upper limb."56 He set the test fairly: "If each partial skeleton indeed comes from a single individual, there would be no other option but to admit that 'mosaic' forms are represented in the hominin fossil record, a conclusion Rupe and Sanford seem to resist." He also noted, fairly, that Berger's team had not published a map of where each bone lay.56
2021 to 2026: Wood's statistics hold on skulls and fail below the neck
In 2021 Wood and his co-author P. Sinclair reran the original data with the cluster methods that another creationist, Colin Reeves, had demanded. Every method gave the same result: "Au. sediba consistently clusters with members of genus Homo, even when using alternative distances and cluster analysis methods."18 Forcing sediba into either australopith group gave strongly negative fit scores.18 Wood summed it up on his blog: "I simply failed to falsify my original conclusions that Au sediba and Homo naledi were human."57
In 2023 Wood and Peter Brummel built the first large set of postcranial characters, 239 of them, and sediba was the one taxon that changed sides. "The only exception to this trend is Australopithecus sediba, which clusters with Homo taxa with craniodental characters but not with postcranial characters."2 With postcranial characters, "Au. sediba appears to be merely adjacent to the Homo taxa and just as close to other Australopithecus taxa as it is to the nearest Homo taxa."2 With 72.4 percent of its postcranial character states known, they judged the result "unlikely to be a statistical artifact." When skull and skeleton were combined, sediba went back to the Homo cluster.2 They gave both readings. They "might cautiously interpret" the results as consistent with sediba being human,2 but they also wrote that "with Au. sediba, no such supplemental evidence exists and legitimate uncertainty remains."2 And they named the child's skull as the weak point: "A complete adult skull might support placing Au. sediba outside of the human holobaramin."2
Peter Line still calls it an ape, and Rupe has partly changed his mind. Line wrote in 2022 that sediba's ape-like features "appear to indicate unambiguously that it was an apish primate."58 Rupe's 2026 paper on Lucy no longer treats MH2's shoulder as an ape's. He now argues that "the anatomical association of the MH 2 scapula with a morphologically human hand strongly suggests the scapula is also human."59 In 2017 he and Sanford had called the same upper limb "unmistakably ape-like."20
Who puts sediba where
| Writer | Year | Where | Placement | Main reason given |
|---|---|---|---|---|
| Peter Line | 2010, 2011, 2022 | creation.com; Journal of Creation | Ape (australopith) | small brain, long arms, climbing shoulder, cone-shaped chest |
| Brian Thomas | 2010, 2011 | Institute for Creation Research | Ape | "ape features," long arms, small head |
| Todd Wood | 2010 | Answers Research Journal | Human | clusters with Homo on skull and tooth characters |
| Marvin Lubenow | 2010 | Answers in Genesis | Ape, one kind with africanus | chimp-like skull; too late to be an ancestor |
| David Menton | 2010 | Answers Research Journal | Ape | brain size, sloping face, long arms, nose |
| Anne Habermehl | 2010 | Answers Research Journal | Ape | only Neanderthals are early humans |
| David DeWitt | 2010 | Answers Research Journal | Ape | arm and shoulder built for weight-bearing; "false positive" |
| Todd Wood | 2013 | ICC Proceedings | Undecided | postcranial analysis inconclusive; "reasons to doubt" |
| Jean O'Micks | 2016, 2017 | Answers Research Journal | Ape (australopith) | postcranial characters; brain size against body size |
| Rupe and Sanford | 2017 | Contested Bones | Mixture of human and ape bones | mixed bone bed; traits sorted by bone |
| Brian Thomas | 2020, 2022 | Institute for Creation Research | Mixture | follows Rupe and Sanford |
| Sinclair and Wood | 2021 | Answers Research Journal | Human | skull and tooth result survives new methods |
| Wood and Brummel | 2023 | ICC Proceedings | Probably human, "legitimate uncertainty" | skull and combined data say human; skeleton alone does not |
| Christopher Rupe | 2026 | CRSQ | MH2's hand, shoulder and the pelvis human | the hand and shoulder were found together; the pelvis is human-shaped |
Two things stand out. First, the ape placement is the majority view, but only Wood has tested it with numbers, and his own skeleton test leans toward it. Second, the mixture placement grew from one book and spread to the Institute for Creation Research without new evidence.
Part 6: What each young-earth placement must explain
Each of the three placements fits some of the evidence and has to explain the rest. The date, which all three share, is priced in Part 3.
If sediba was human
The human placement must explain an australopith body with an australopith brain. An adult sediba brain of about 440 cc at most would be the smallest in Wood's human kind. The two Homo naledi skulls, the next smallest that Wood counts as human, held about 465 and 560 cc,60 and the H. habilis average in Berger's table is 631.1 Wood is right that brain size alone cannot decide the question; his paper says the method's strength is that it does not reduce humanness "to cranial capacity, limb proportions, ... bipedality."31 But the brain does not stand alone. The arm and shoulder are "predominantly primitive" and built for climbing,7 the upper chest is ape-like,8 the body weighed 30 to 36 kilograms,6 and the leg was not lengthened for walking long distances.6 Wood's own skeleton characters no longer put sediba with Homo.2
It must also explain why its Homo-like features sit mainly in a child's skull. Kimbel and Rak found that growth accounts for "key aspects of MH 1's resemblance to Homo."16 Wood and Brummel raised the same possibility for their own data and said "a mature Au. sediba skull is likely needed to resolve these questions."2 Menton made the same point in 2010, objecting that MH1 was a juvenile.35
And it must place people with chimpanzee-sized brains and climbing arms in South Africa after the dispersal from Babel. On the young-earth timeline that is within a few centuries of Noah. Wood's model allows humans to have changed fast after the Flood, but no young-earth writer has shown how, within a few centuries of Noah, one branch of his descendants came to have a brain the size of an australopith's and arms built for climbing. This is a gap, not a computed refutation: no model exists to price.
If sediba was an ape
The ape placement fits the brain, the body and the arms, and it agrees with the mainstream classification. It also agrees with Wood's own skeleton result. It must still explain three things.
First, why the skull and teeth cluster with Homo in every full-sized analysis by creationism's own method. They did so in 2010, in 2016, in 2021 with Reeves's methods, and in 2023, and again when skull and skeleton were combined.1751182 Only Wood's 2013 runs on very small samples of species failed to show it, and Wood traced that to the small samples.19 Berger's own character table, on Wood's count, has sediba sharing 51 of 69 states with H. erectus and 33 with A. africanus.31 The ape camp has answered this with words, not numbers. Menton called the published characters "the biased opinions of evolutionists,"35 but the bias would have to run the wrong way, since the people who scored them call sediba an australopith. The best available answer is the juvenile skull. It is a mainstream answer and a reasonable one, but no young-earth writer has tested it.
Second, why an ape had a human-like hip, hand and lower back. This matters beyond sediba. Young-earth writers often treat a human-shaped pelvis as a mark of a human. Rupe argues from Lucy's pelvis that she was human, says the Sterkfontein pelvis Sts 14 "may therefore be another example of a misclassified human pelvis," and pictures the sediba pelvis among his "potentially misclassified human pelvises."59 Anyone who calls sediba an ape has conceded that an ape could have hip blades turned "as in later Homo,"59 and so cannot use that feature to prove that other fossils were human. Wood saw one side of this in 2010: if sediba is human, "the mosaic nature of australopith anatomy noted by creationists ... may not be uniquely diagnostic of that group."17 The other side follows by the same logic: if sediba is an ape, human-like hips do not mark humans.
Third, the same post-Flood date as everyone else. The ape camp does not need Babel, but it still needs Malapa's flowstones to have formed after the Flood.
If sediba was a mixture
The mixture placement must explain an excavation that found the skeletons partly joined together. The block holding MH2 contained "a partially articulated upper limb, including most of the right scapula, the lateral half of the right clavicle, parts of the thorax, and lower limb elements."3 Other pieces of MH2's shoulder blade, found in another block, joined these across the break, and that block also held MH2's lower jaw.3 MH2's wrist and hand were found "in a cluster and in close association with the remainder of the right upper limb."56 The taphonomic study counted MH1 and MH2 among "at least seven complete individuals" that "accumulated inside a cave chamber where they decomposed and mummified."4 Contested Bones itself says the bones were found "in loose-to-close anatomical association—some physically joined together."20
It must explain why the human-looking parts come in pairs. Both skeletons have the human-like hip blade, both have a heel process found in no other fossil hominin, and both have the same small molars and the same unusual carbon isotopes in their tooth enamel.101010 On the mixture reading, a human hip was wrongly joined to each of two ape skeletons, both found in place, and the two "apes" happened to share a heel bone seen in no other species and a diet unlike any other hominin's of the time. That is several independent coincidences, each improbable, and the reading offers no reason for any of them.
It must explain where the human bones came from. Contested Bones says the bed held "at least 18 different species (including Homo, Australopithecus, and primates)."20 The published list of the 18 taxa has no Homo, and the only primate besides the hominins is "a partial skull assigned to a cercopithecoid (Papio angusticeps)," a baboon.4 There is no third, human skeleton at Malapa from which a hip or a hand could have strayed.
And it has lost the support it claimed. Rak's two-genera paper argues that MH1 and MH2 are two individuals of two genera, not that either skeleton is a jumble; on Rak's reading the whole of MH2, climbing shoulder included, would be Homo.42 Rupe now accepts the association of MH2's hand and shoulder, and argues from it.59 What remains of the mixture claim is a fair complaint: Berger's team has not published a plan of where each bone lay.56 That plan would settle the question, and the article lists it among the open issues.
Objections and responses
"Even the experts cannot agree whether sediba is Australopithecus or Homo. The whole story is guesswork." The disagreement is real, and this article reports it. But it is a disagreement about which branch sediba sits on, between specialists who all date it to about 2 million years. Robinson's earliest scenario puts the species at 2.95 million years;39 Du and Alemseged's model and Dembo's tree all work inside the same range. None of them is evidence for an age of a few thousand years.
"A mosaic of ape and human features is exactly what a transitional form should look like." A mosaic shows that the combination existed. It does not show which way, if any, the lineage went, and the discoverers admit that some of sediba's human-like walking features arose more than once: "homoplasy is implied."9 The young-earth side should concede the other half plainly. Nalin, a creationist, wrote that if each skeleton is one individual, "there would be no other option but to admit that 'mosaic' forms are represented in the hominin fossil record."56 The evidence says each skeleton is one individual. So mosaic forms exist, and the question is what they were, not whether they were.
"Wood's baraminology is unreliable, so his result should be ignored." Colin Reeves made that argument in creationism's own journal.61 But Sinclair and Wood reran the analysis with the methods Reeves recommended, and the skull-and-tooth result did not move.18 This article treats the method's results as what creationism's own practitioners found with creationism's own method, not as measurements of created kinds. Read that way, they count twice: once for Wood's human placement on the skull, and once against it on the skeleton.
"The article picks Wood's skeleton-only result and ignores his combined result, which put sediba back with Homo." The combined result is a fair point for the human placement, and Wood and Brummel argue that it cannot be blamed on the skull, since the combined set has more known skeletal characters than skull characters.2 The article's verdict does not rest on the skeleton result alone. It rests on the brain, the body size, the arm and shoulder, the upper chest, the child's skull, and the mainstream classification, which all point the same way. Wood and Brummel say the question is open until an adult skull is found, and so does this article.
"Answers in Genesis showed that the 1.977-million-year date is circular." Part 3 shows what holds and what does not. The two-thousand-year precision is an inference from magnetism, and the critics were right to say so. But the date did not come from the Huckleberry Ridge Tuff, the uranium-lead dates use no argon standards, and the bracket of about 2.03 to about 1.8 million years needs no magnetic match at all.
"Berger moved the date to make sediba old enough to be an ancestor." The re-dating moved the fossils by tens of thousands of years at most inside a bracket that the 2010 uranium-lead maximum already set. And it did not make sediba old enough: it is still about 800,000 years younger than the oldest jaw now assigned to Homo.14
"It walked upright, so it was human." Young-earth writers do not accept that rule for Lucy, and they should not accept it here. Sediba's walk, as its describers reconstruct it, was unlike a human's,27 and its leg was not lengthened for long-distance walking.6 Peter Line made the same point: if it walked upright, it was "likely not as a human."58
"Brain size does not decide humanity. Some human groups had small brains." That is true, and Wood is right to resist reducing humanness to one trait.31 The argument here is not the brain alone. It is the brain together with a 30-to-36-kilogram body, climbing arms, an ape-like upper chest and an ape-like heel, the same suite that young-earth writers use to call A. africanus an ape. The sister article The South African Australopiths applies that suite to africanus.
"Rak and colleagues proved that sediba is two creatures, as Rupe and Sanford said." Rak's team argued from one part of the jaw that MH1 and MH2 belong to two genera.42 That is a claim about two individuals, not a claim that either skeleton is a jumble of bones. Ritzman's earlier study found one variable species,43 Hawks and Berger showed the same contrast within single Homo samples,10 and Peter Line judged the feature unsuitable for telling species apart.44
"The skeletons came from a mixed bone bed, so the mixture claim cannot be ruled out." The sediment was partly mixed: Val's team found material washed in from other chambers.4 But the hominin skeletons were found partly articulated, and the human-like and ape-like parts were joined within single blocks.33 A published map of where each bone lay would end the argument; the excavators have not printed one.56
Issues and unanswered questions
- No adult sediba skull has been described. The only skull is MH1's, a child's. Wood and Brummel, Kimbel and Rak, and Mongle's team all say an adult skull could change the verdict.16412 More individuals "await excavation/preparation."23
- Several of the key descriptions were read only as abstracts. The 2011 endocast, hand and foot papers and the 2013 arm, chest, spine, teeth and leg papers sit behind paywalls or bot challenges. Their abstracts are quoted accurately, but the measurements in their bodies were not checked. The 420 cc brain figure comes from the 2010 paper's main text; its derivation is in a supplement that was not reached.
- The capping flowstone has two different dates in the same supplement, 1.975 ± 0.142 in the text and 2.048 ± 0.140 in the data table.5 The main text of the 2011 dating paper was not obtained.
- MH1's age at death depends on the growth standard. It is 12 to 13 years by human standards and 9 to 11 by a chimpanzee's.110 The 2017 study behind the chimpanzee figure was not read.
- No plan of the excavation has been published. Nalin asked for one in his review.56 It is the one document that would settle the mixture claim either way.
- No young-earth writer has given Malapa a post-Flood history or explained its flowstone dates. The only critique of the dating, from Answers in Genesis in 2011, addresses its precision, not its age.33
- The second edition of Contested Bones (2019) was not read. Rupe's 2026 paper cites its pages on sediba; its argument may differ from the 2017 edition quoted here.
- The "jumble of species" news story behind the mixture claim was not obtained. Thomas and Nalin both cite a 2014 New Scientist report, and Contested Bones describes a conference presentation that year by Ella Been and Yoel Rak on the lower-back vertebrae. Neither the news story nor the presentation was read for this article.
- Wood's 2023 combined result is the strongest point for the human placement and has not been answered. No creationist who calls sediba an ape has published an analysis of the combined characters.
Verdict
What the anatomy shows: Australopithecus sediba was a small-brained, small-bodied, tree-climbing hominin that walked upright in its own way and had a more human-like face, hand, hip and lower back than other australopiths. Its describers called it "an australopith adaptive grade."1 It was not human in the anatomical sense, and nothing in its skeleton requires a human placement.
What the date shows: On standard methods the fossils are about 2.0 million years old. The age is bracketed by uranium-lead dates above and below and by the animals buried with them. The precise figure of 1.977 million years rests on a magnetic match that the young-earth critics were right to question, but the bracket does not.
Ancestry: Sediba is unlikely to be the ancestor of Homo, because older Homo fossils exist and its most Homo-like skull is a child's. The discoverers' hypothesis survives only with a long missing lineage.
The young-earth placements: The ape placement, held by most young-earth writers, fits the evidence best and agrees with the mainstream classification and with Wood's own skeleton data. Its cost is that it must accept human-like hips and hands in an ape, which weakens the use of those traits to call other fossils human. Wood's human placement rests on the skull and teeth of a child, and Wood himself says an adult skull may overturn it. The mixture placement of Rupe, Sanford and the Institute for Creation Research is contradicted by the excavation and the taphonomy, and Rupe's own 2026 argument accepts part of the association it denied; it should be retired. All three placements share an unpaid debt: Malapa's flowstones must have formed after the Flood, with uranium decaying several hundred times faster than it does now.
Sources
- 1.
Berger, Lee R. et al. “Australopithecus sediba: A New Species of Homo-Like Australopith from South Africa.” Science 328(5975):195–204. Apr 9, 2010. The paper that names the species, by the team that found it. It describes the juvenile skeleton MH1 as the type specimen and the adult MH2 as the paratype, lists the skull and tooth characters that keep the species in Australopithecus and the hip features it shares with Homo, and proposes it as a candidate ancestor of Homo while noting the timing problem. ↩
- 1a.
Page 195: “The first hominin specimen recovered from Malapa was the right clavicle of MH1 (UW88-1), discovered by Matthew Berger on 15 August 2008. MH2 is an adult individual represented by isolated maxillary teeth, a partial mandible, and partial postcranial skeleton that we designate as the species paratype.” ↩ ↩ ↩
- 1b.
Page 195: “Although MH1 is a juvenile, the second molars are already erupted and in occlusion. Using either a human or an ape model, this indicates that MH1 had probably attained at least 95% of adult brain size”. ↩ ↩ ↩
- 1c.
Page 196: “The minimum cranial capacity of MH1 is estimated at 420 cm3”. The skull is described as fragmented and slightly distorted, so the figure is a minimum. ↩
- 1d.
Page 196: “small cranial capacity, pronounced glabelar region, patent premaxillary suture”. The first three of the craniodental features the authors give for placing the species in Australopithecus. ↩
- 1e.
Page 200, table 1: Cranial capacity, species averages in cubic centimetres: A. afarensis 415, A. africanus 442, A. sediba 420, H. habilis 631, H. rudolfensis 751, H. erectus 900. ↩ ↩ ↩
- 1f.
Page 203: “this species shares more derived features with early Homo than does any other known australopith species (Table 1 and table S2) and thus represents a candidate ancestor for the genus, or a sister group to a close ancestor that persisted for some time after the first appearance of Homo.” ↩
- 1g.
Page 203: “The discovery of a <1.95-million-year-old (16) australopith that is potentially ancestral to Homo is seemingly at odds with the recovery of older fossils attributed to the latter genus (5) or of approximately contemporaneous fossils attributable to H. erectus (6, 30).” ↩
- 1h.
Page 203: “Although the skull and skeleton of Au. sediba do evince derived features shared with early Homo, the overall body plan is that of a hominin at an australopith adaptive grade.” ↩ ↩ ↩ ↩
- 1i.
Page 204: “The pattern of dental eruption and epiphyseal fusion exhibited by MH1 indicates that its age at death was 12 to 13 years by human standards, whereas in MH2 the advanced degree of occlusal attrition and epiphyseal closure indicates that it had reached full adulthood”. ↩ ↩
- 1a.
- 2.
Wood, Todd Charles, and P. S. Brummel. “Hominin Baraminology Reconsidered with Postcranial Characters.” Proceedings of the Ninth International Conference on Creationism, 251–266. Edited by J. H. Whitmore. 2023. The first large creationist data set of characters from below the skull: 239 postcranial characters for 14 taxa, analysed alone and with skull characters in 44 clustering runs. Sediba was the only taxon that changed sides between the skull and skeleton analyses.
- 2a.
Page 251, section Abstract: “The only exception to this trend is Australopithecus sediba, which clusters with Homo taxa with craniodental characters but not with postcranial characters.” ↩ ↩
- 2b.
Page 260: “With craniodental characters, Au. sediba appears in the midst of the Homo taxa, but with postcranial characters, Au. sediba appears to be merely adjacent to the Homo taxa and just as close to other Australopithecus taxa as it is to the nearest Homo taxa.” ↩
- 2c.
Page 263: “In the case of Homo naledi, cultural evidence of body disposal (Dirks et al. 2010) tentatively confirms their status as human, but with Au. sediba, no such supplemental evidence exists and legitimate uncertainty remains.” ↩
- 2d.
Page 264: “With 72.4% of Au. sediba’s postcranial character states scored, this clustering is unlikely to be a statistical artifact. With the combined craniodental and postcranial characters, Au. sediba clusters consistently with Homo taxa again”. “This difference between clustering with postcranial characters versus the combined character set cannot be attributed to a bias towards craniodental characters, because only 49% of Au. sediba’s craniodental characters are scored.” ↩ ↩ ↩
- 2e.
Page 265: “Thus, we might cautiously interpret our present results as consistent with previous classifications of Au. sediba as human.” ↩
- 2f.
Page 265: “A complete adult skull might support placing Au. sediba outside of the human holobaramin.” ↩ ↩
- 2g.
Page 265: “At this point, a mature Au. sediba skull is likely needed to resolve these questions.” ↩ ↩ ↩
- 2a.
- 3.
Berger, Lee R. “Australopithecus sediba and the earliest origins of the genus Homo.” Journal of Anthropological Sciences 90:117–131. 2012. Berger's own account of the discovery and his case for sediba as the best candidate ancestor of Homo, written in answer to critics before the 2.8-million-year Ledi-Geraru jaw was published. It is the source for how the two skeletons were found.
- 3a.
Page 117: “The site of Malapa was first discovered by the author on August 1, 2008, during the course of a geospatial survey for new fossil-bearing cave deposits in the dolomitic region of the Cradle of Humankind World Heritage Site”. ↩
- 3b.
Page 118, Fig. 1 caption: “These blocks had been removed from their in-situ position by late 19th or early 20th Century mining activities and are not in their original positions.” ↩
- 3c.
Page 118: “On the 15th of August 2008, upon the author’s initial return to the site to investigate its fossilbearing potential, the first hominin specimens were discovered by the author’s son, Matthew.” ↩ ↩
- 3d.
Page 118: “the discovery by the author, on September 4, 2008, of a second, well-preserved adult partial skeleton and two associated maxillary teeth (MH2). These latter specimens were importantly found in situ in the calcified clastic sediments of the mining pit, thus giving precise location to the remains and leading to the discovery of the in-situ location of MH1”. ↩
- 3e.
Page 118: “Removal of the block containing MH2 took place in late 2008, and preparation of the specimen revealed a partially articulated upper limb, including most of the right scapula, the lateral half of the right clavicle, parts of the thorax, and lower limb elements.” ↩ ↩ ↩
- 3f.
Page 118: “the remaining parts of the adult right scapula and clavicle were found in a block that also contained the adult’s mandible. The articulation between the scapula pieces, clearly allowed a direct association of these elements.” ↩ ↩
- 3g.
Page 117: “This opinion however, does not take into account either the poor condition of these fossils, as well as the numerous problems with both the criteria used to associate them with the genus Homo, nor the questionable provenance of each of these specimens.” “Malapa is almost certainly not the first chronological appearance of Au. sediba, it is only the first known fossil occurrence. Au. sediba should therefore be considered a strong potential candidate ancestor of the genus Homo”. Page 126: “and perhaps the best candidate”. ↩
- 3a.
- 4.
Val, Aurore et al. “Taphonomic Analysis of the Faunal Assemblage Associated with the Hominins (Australopithecus sediba) from the Early Pleistocene Cave Deposits of Malapa, South Africa.” PLoS ONE 10(6):e0126904. 2015. A study of how the bones in the Malapa deposit got there: which body parts are present, the ages of the animals at death, how the bones broke, and the marks on their surfaces. It finds a natural death trap with no scavenger access, many articulated skeletons, and some sediment washed in from other chambers. It is the main evidence on whether the two skeletons could be a mixture.
- 4a.
Page 1, section Abstract: “The diversity of the faunal spectrum, presence of animals with climbing proclivities, abundance of complete and/or articulated specimens, occurrence of antimeric sets of elements, and lack of carnivore-modified bones, indicate that animals accumulated via a natural death trap leading to an area of the cave system with no access to mammalian scavengers.” ↩
- 4b.
Page 1, section Abstract: “The co-occurrence of well preserved fossils, carnivore coprolites, deciduous teeth of brown hyaena, and some highly fragmented and poorly preserved remains supports the hypothesis of a mixing of sediments coming from distinct chambers, which collected at the bottom of the cave system through the action of periodic water flow.” ↩ ↩
- 4c.
Page 5: “The assemblage comprises 18 species of ungulates, carnivores, primates, rodents and birds”. “Non-hominin primates are represented only by a partial skull assigned to a cercopithecoid (Papio angusticeps)”. “hominins (MNI: 6; MNE: 160, and NISP: 242)”. MNI is the minimum number of individuals; NISP the number of identified specimens. ↩ ↩ ↩
- 4d.
Page 9: “Based on the articulated specimens and antimeric sets of bones, we propose that at least seven complete individuals, including the two hominins MH1 and MH2 (Table 1), accumulated inside a cave chamber where they decomposed and mummified.” ↩ ↩ ↩
- 4a.
- 5.
Pickering, Robyn et al. “Australopithecus sediba at 1.977 Ma and Implications for the Origins of the Genus Homo.” Science 333(6048):1421–1423. Sep 9, 2011. The revised date. A newly exposed flowstone above the fossil-bearing sediment was dated by uranium-lead and found to be reversed in polarity, which ruled out the 2010 match to the Olduvai Subchron and led the team to place the fossils in a short normal-polarity excursion. Its supporting material gives the data and the reasoning. ↩ ↩ ↩
- 5a.
Section Supporting Online Material, Text S3, SOM page 15: “PM10 records a reversed polarity (Fig. S4) and has been U-Pb dated to 1.975 ±0.142 Ma (2.12-1.83 Ma). Given this age the reversed flowstone PM10 must be older (>1.95 Ma), rather than younger (<1.78 Ma) than the Olduvai Subchron.” ↩ ↩ ↩
- 5b.
Section Supporting Online Material, Text S3, SOM page 15: “The pre-Olduvai excursion (17) at 1.977 Ma is the only validated or suggested excursion between the Huckleberry Ridge event at 2.05-2.03 Ma and the Olduvai sub-Chron at 1.95 Ma (15).” “the Malapa data is the best terrestrial evidence for this reversal, which had previously only been noted in deep sea sediment cores (18). The pre-Olduvai excursion is estimated at around 3 ka in duration (18) and suggests the sediments accumulated rapidly at 1.977 ±0.002 Ma.” Reference 18 is a study of geomagnetic excursions in two Ocean Drilling Program cores from the Iceland Basin. ↩ ↩
- 5c.
Section Supporting Online Material, Text S3, SOM page 15: “However, it also shows the complexity of undertaking magnetostratigraphic analysis of such deposits and the potential for misinterpretation of polarities to the wrong Chron or Sub-Chron in the absence of precise stratigraphic control and detailed absolute age dating.” ↩
- 5d.
Section Supporting Online Material, Text S4, SOM page 16: “The resulting MSWD is considerable at 606 and reflects the large scatter of the points away from the slope due to variability in the isotopic composition of the common Pb component.” Section Supporting Online Material, Text S4, SOM page 17: “The final U-Pb age for Flowstone 2 (Fig. S6) is relatively precise, with a 7% error, which is typical for the cave sites in the Cradle of Humankind”. MSWD measures how far the data points scatter from the fitted line compared with their stated errors; a value near 1 means the scatter is what the errors predict. ↩
- 5e.
Section Supporting Online Material, Text S3, SOM page 15: “U-Pb dated to 1.975 ±0.142 Ma”. Section Supporting Online Material, SOM page 22, table S3: The Tera-Wasserberg age column gives 2.048 with a 2SE of 0.140 (7 percent) for the same flowstone, sampled as M6 and M7. ↩ ↩
- 5a.
- 6.
Holliday, Trenton W. et al. “Body Size and Proportions of Australopithecus sediba.” PaleoAnthropology, 406–422. 2018. Estimates of body mass from the size of the femoral head for three Malapa individuals, with comparisons of limb proportions against apes, australopiths and Homo. The method has wide error, and the paper says so.
- 6a.
Page 408: “all three Au. sediba individuals had body masses between ca. 30-36 kg, placing them in the size range of smaller individuals of Au. afarensis and Au. africanus, and well below the size range of specimens attributed to early Homo”. ↩ ↩ ↩
- 6b.
Page 406, section Abstract: “In addition, the lower limb does not appear to be as elongated as that of early Homo, suggesting that long-distance terrestrial bipedality was not a regular part of the species' behavioral repertoire.” ↩ ↩ ↩
- 6a.
- 7.
Churchill, Steven E. et al. “The Upper Limb of Australopithecus sediba.” Science 340(6129):1233477. 2013. A description of the shoulder blade, collarbone and arm bones of the Malapa hominins, excluding the hand. ↩
- 8.
Schmid, Peter et al. “Mosaic Morphology in the Thorax of Australopithecus sediba.” Science 340(6129):1234598. 2013. A reconstruction of the rib cage from the ribs of both skeletons. ↩
- 9.
Zipfel, Bernhard et al. “The Foot and Ankle of Australopithecus sediba.” Science 333(6048):1417–1420. 2011. A description of MH2's ankle and heel, found articulated with the lower shin bone. The authors infer a walk unlike that of other hominins and some climbing, and say their reading holds "if present models of foot function are correct." ↩
- 9a.
Section Abstract: “The ankle (talocrural) joint is mostly humanlike in form and inferred function”. “Au. sediba is apelike in possessing a more gracile calcaneal body and a more robust medial malleolus than expected.” ↩ ↩
- 9b.
Section Abstract: “homoplasy is implied in the acquisition of bipedal adaptations in the hominin foot”. Homoplasy means a similar feature that arose independently in separate lineages rather than being inherited from a common ancestor. ↩ ↩
- 9a.
- 10.
Hawks, John, and Lee R. Berger. “Mandibular ramus morphology and species identification in Australopithecus sediba.” South African Journal of Science 118(3/4):12544. 2022. A short reply, by two members of the discovery team, to the 2021 claim that MH1 and MH2 belong to two genera. It lists the features the two skeletons share across the body and shows the same contrast in jaw shape inside single fossil samples of Homo from Algeria and Spain.
- 10a.
Page 1: “Excavation at Malapa has recovered substantial evidence of the burial position of each skeleton, including joints found in articulation or in close anatomical proximity, with all recovered parts showing a low degree of post-mortem dispersion.” ↩
- 10b.
Page 1: “MH2 is adult and MH1 is juvenile with postcranial and dental elements consistent with a maturational age of between 9 and 11 years when compared to a chimpanzee maturational pattern.” “The pelvic remains of MH1 and MH2 are closely similar in size, and similar in most aspects of morphology, but differ in features related to sex, suggesting female sex for MH2 and male sex for MH1.” ↩ ↩ ↩
- 10c.
Page 1: “The lateral plantar process of the MH2 calcaneus has a dorsal position not observed in any other fossil hominin except for the immature calcaneal apophysis of MH1.” ↩
- 10d.
Page 1: “Both MH1 and MH2 share a more human-like parasagittal orientation of the ilium, contrasting not only with other Australopithecus pelves but also with pelvic material from Homo erectus and Homo naledi.” ↩ ↩
- 10e.
Page 1: “Both MH1 and MH2 share small molar size and small mandibular corpus area compared to samples of other species of Australopithecus.” “both have near-identical enamel carbon-13 values that are far below any other contemporary sample of Australopithecus, Paranthropus, or Homo.” ↩ ↩ ↩
- 10f.
Page 1: “But Rak et al. include only 12 fossil mandibles for comparison in addition to MH1 and MH2 in their analysis. Only five of these are used to represent the entire variation exhibited by the genus Homo”. Page 3: “The morphological features that Rak et al. describe as derived exclusively in Australopithecus actually occur widely across Homo.” Reference numerals after "Rak et al." are omitted. ↩ ↩
- 10a.
- 11.
Kivell, Tracy L. et al. “Australopithecus sediba Hand Demonstrates Mosaic Evolution of Locomotor and Manipulative Abilities.” Science 333(6048):1411–1417. 2011. A description of MH2's nearly complete right wrist and hand, one of the most complete early hominin hands known. ↩
- 12.
Kibii, Job M. et al. “A Partial Pelvis of Australopithecus sediba.” Science 333(6048):1407–1411. 2011. A description and reconstruction of the hip bones of both Malapa skeletons, comparing them with other australopiths and with Homo. The MH2 reconstruction has been criticised and defended in later papers. ↩
- 12a.
Section Abstract: “These remains share some features with australopiths, such as large biacetabular diameter, small sacral and coxal joints, and long pubic rami. The specimens also share derived features with Homo, including more vertically oriented and sigmoid-shaped iliac blades, greater robusticity of the iliac body, sinusoidal anterior iliac borders, shortened ischia, and more superiorly oriented pubic rami.” ↩ ↩
- 12a.
- 13.
Williams, Scott A. et al. “The Vertebral Column of Australopithecus sediba.” Science 340(6129):1232996. 2013. A description of the two partial spines, with an estimate of how many lumbar and sacral vertebrae the species had. ↩
- 14.
Villmoare, Brian et al. “Early Homo at 2.8 Ma from Ledi-Geraru, Afar, Ethiopia.” Science 347(6228):1352–1355. 2015. The description of LD 350-1, half a lower jaw with a mix of Homo and australopith traits, now the oldest fossil assigned to Homo. Its age comes from volcanic ashes above and below the fossil-bearing silts and the rate at which the silts built up. Locators are to the online first-release version.
- 14a.
Section first-release version, page 1: “The specimen, securely dated to 2.80-2.75 Ma, combines derived morphology observed in later Homo with primitive traits seen in early Australopithecus.” ↩ ↩ ↩ ↩
- 14b.
Section first-release version, page 1: “The LD 350-1 mandible was recovered on the surface of finely bedded fossiliferous silts 10 m conformably above the Gurumaha Tuff (Fig. 1).” “The Gurumaha Tuff is radiometrically dated to 2.842 Ma ± 0.007 Ma”. “Based on the current chronostratigraphic framework for Ledi-Geraru, we consider the age of LD 350-1 to be 2.80-2.75 Ma.” ↩
- 14a.
- 15.
Du, Andrew, and Zeresenay Alemseged. “Temporal evidence shows Australopithecus sediba is unlikely to be the ancestor of Homo.” Science Advances 5(5):eaav9038. 2019. A probability model of how likely it is to find an ancestor's only known fossils 800,000 years after its descendant's first fossils, plus a review of 28 proposed ancestor-descendant pairs of hominins. The result depends on its assumptions about species lifespans and on LD 350-1 being Homo, and the paper tests some of them. Mirror: PMC
- 15a.
Section Abstract: “Australopithecus sediba has recently been proposed as the ancestral species of Homo, although it postdates earliest Homo by 800,000 years. Here, we use probability models to demonstrate that observing an ancestor's fossil horizon that is at least 800,000 years younger than the descendant's fossil horizon is unlikely (about 0.09% on average).” The model gives both species temporal ranges of 0.97 million years, the average estimated for hominin species by Robinson and colleagues, and assumes fossils are equally likely to be preserved throughout a range. ↩ ↩ ↩
- 15b.
Section Discussion: “Results show that calculated P values are still small even when relaxing the age of earliest Homo to 2.33 Ma ago or hominin temporal durations to 2 Ma. For example, P values exceed 0.05 only when range overlap is at least 70%, and the mean and maximum P values over all possible overlap values are only 0.04 and 0.20, respectively”. ↩
- 15a.
- 16.
Kimbel, William H., and Yoel Rak. “Australopithecus sediba and the emergence of Homo: Questionable evidence from the cranium of the juvenile holotype MH 1.” Journal of Human Evolution 107:94–106. 2017. A test of whether MH1's Homo-like face would have stayed that way as the child grew, using growth series of chimpanzee, gorilla and human skulls, and a search for features MH1 shares with the Sterkfontein australopiths. ↩
- 16a.
Section Abstract: “Given the existence of 2.8 myr-old fossils of Homo in eastern Africa, this hypothesis implies a ghost lineage spanning at least 800 kyr.” “the hypothesis of an extensive ghost lineage connecting A. sediba to the root of the Homo clade is unwarranted.” ↩
- 16b.
Section Abstract: “Based on data from a late-growth series of chimpanzee, gorilla, and modern human crania, we found that key aspects of MH 1's resemblance to Homo can be accounted for by its immaturity.” “We argue that MH 1 provides clear evidence that A. sediba was uniquely related to A. africanus”. ↩ ↩ ↩
- 16a.
- 17.
Wood, Todd Charles. “Baraminological Analysis Places Homo habilis, Homo rudolfensis, and Australopithecus sediba in the Human Holobaramin.” Answers Research Journal 3:71–90. May 5, 2010. The first statistical test of the young-earth claim that fossil hominins divide into human and non-human created kinds. Wood, a creationist biologist, reanalysed eight published sets of skull and tooth characters by baraminic distance correlation and multidimensional scaling. It is the paper that put sediba in the human kind, and it lists its own weaknesses.
- 17a.
Page 71, section Abstract: “In contrast to many creationist claims, however, the present results indicate that Homo habilis, Homo rudolfensis, and—most surprisingly—Australopithecus sediba belong in the human holobaramin.” ↩ ↩
- 17b.
Page 73, table 2: The Berger et al. (2010) data set: 10 taxa (7 australopiths, 3 Homo), 69 characters, 55 missing character states (8.0 percent), craniodental. Wood added characters for Pan and H. sapiens. ↩
- 17c.
Page 81: “The position of Au. sediba is especially clear. It was positively correlated with all Homo species (with bootstrap values >90%) and did not positively correlate with any australopiths. Even conventional paleoanthropologists disagree on the classification of sediba (see Balter 2010). In light of the present findings, it seems more appropriate to refer sediba to genus Homo.” ↩ ↩
- 17d.
Page 81: “As of this writing, there has been no creationist commentary or interpretation of Au. sediba, but given sediba’s extremely ape-like forearms (Berger et al. 2010), it seems likely that many creationists would prefer to place sediba among the australopiths.” ↩
- 17e.
Page 83: “Though the present research unequivocally groups H. habilis, H. rudolfensis, and “Au.” sediba with other species of Homo, this should certainly not be considered definitive.” Page 84: “It is possible that inclusion of postcranial characters in future baraminological analyses might support the separation of H. habilis and “Au.” sediba from the human holobaramin.” ↩
- 17f.
Page 84: “Alternatively, including “Au.” sediba and Homo habilis in the human holobaramin would suggest that the mosaic nature of australopith anatomy noted by creationists (for example, Hartwig-Scherer 1999; Wise 1994) may not be uniquely diagnostic of that group.” ↩
- 17g.
Page 86: “Third, the dispersal of the human population from Babel would presumably have been led by H. habilis and H. rudolfensis, specimens of which appear stratigraphically lower than any other human species. Specimens of both of these species (and of “Au.” sediba) are known only from Africa”. “Any model of post-Babel distribution must account for the appearance and disappearance of these human species in stratigraphic order.” ↩
- 17a.
- 18.
Sinclair, P., and Todd Charles Wood. “Revising Hominin Baraminology with Medoid Partitioning and Fuzzy Analysis.” Answers Research Journal 14:451–462. 2021. A rerun of the 2010 sediba data set and a larger 391-character set with standard cluster methods, done in answer to Colin Reeves's criticism of baraminology's statistics. Its Table 1 lists which creationists placed sediba, H. floresiensis and H. naledi where.
- 18a.
Page 459: “We found here that Au. sediba consistently clusters with members of genus Homo, even when using alternative distances and cluster analysis methods.” ↩ ↩ ↩ ↩
- 18b.
Page 453: Moving sediba out of the Homo cluster gave it a silhouette width of −0.611 in the Paranthropus cluster and −0.525 in the other australopith cluster, against a strongly positive 0.525 inside the Homo cluster. A silhouette width runs from −1, a misfit, to +1, a perfect fit. ↩
- 18a.
- 19.
Wood, Todd Charles. “Australopithecus sediba, Statistical Baraminology, and Challenges to Identifying the Human Holobaramin.” Proceedings of the Seventh International Conference on Creationism. Creation Science Fellowship. Edited by Mark Horstemeyer. 2013. Wood's own test of his 2010 result using the 78 postcranial characters of the 2010 description and 25 hand characters from 2011. The test was inconclusive, and Wood questions whether the method can identify created kinds from small samples. The proceedings paper has no printed page numbers; pages given are the PDF's.
- 19a.
Page 10, section Discussion: “No analysis of the postcranial characters of Berger, et al. (2010) or Kivell, et al. (2011) revealed any strong affinity between A. sediba and H. sapiens or H. erectus. In fact, in all five BDC analyses of postcranial characters in the present study, A. sediba was neither positively nor negatively correlated with any other taxon.” ↩ ↩
- 19b.
Page 10, section Discussion: “Should the failure of the present analysis constitute evidence against including A. sediba in the human holobaramin? I think not, since failure to corroborate a previous result is not the same as falsifying that result.” ↩
- 19c.
Page 10, section Discussion: “Furthermore, the present results seem to arise from the very small set of taxa used rather than for biological reasons.” “In each case where only craniodental characters were used with small taxon samples (Figures 3 and 6), the clustering seen in Wood’s (2010) original analysis of the same characters is no longer detectable.” ↩
- 19d.
Page 11, section Discussion: “Turning back to basic anatomical and biological considerations, we still find reasons to doubt the humanity of A. sediba. Carlson, et al. (2011) report that the convolution pattern on the frontal lobes of Australopithecus sediba are typically australopith rather than characteristic of Homo.” ↩
- 19a.
- 20.
Rupe, Christopher, and John Sanford. Contested Bones. FMS Publications. 2017. A young-earth book on the hominin fossils by a geologist and a geneticist, arguing that most fossils are either human or ape and that several "transitional" species are mixtures. Chapter 9, pages 175–197, is on sediba. Quotations are from the first edition; a second edition appeared in 2019.
- 20a.
Page 178: “The broken, fragmentary bones were found in loose-to-close anatomical association—some physically joined together. The bones were buried together in a mixed bed containing thousands of bones from at least 18 different species (including Homo, Australopithecus, and primates).” ↩ ↩
- 20b.
Page 183: “However, the human-looking hip appears to have been mistakenly combined with australopith bones. This is likely, considering the mixed bone bed from which the fossils were recovered.” ↩
- 20c.
Page 185: “Consistent with the funnel-shaped upper thorax, the upper limb bones attributed to Sediba are unmistakably ape-like, revealing an anatomy perfectly suited for tree-dwelling life.” The bones listed include the scapula, or shoulder blade. ↩ ↩
- 20d.
Page 195: “What Berger and colleagues reconstructed is not a new species but rather appears to be a chimeric skeleton (a mixture of human and non-human bones).” ↩ ↩
- 20a.
- 21.
The ratios divide the age of the Malapa fossils, 1.977 million years,5 by the time a young-earth chronology allows since the cave filled. On Creation Ministries International's figure of "some 4,500 years" since the caves formed,62 1,977,000 / 4,500 = 439. Hardy and Carter put the Flood "certainly between 3386 bc and 2256 bc,"63 so at most 5,411 years before 2026, and 1,977,000 / 5,411 = 365. Using the capping flowstone's lowest age, 1.83 million years,5 instead of 1.977 gives 407 and 338. If sediba was human and arrived after the dispersal from Babel, the time available is shorter and the ratio larger. The figures are the factor by which uranium decay would have to run faster than today, for the whole time since the flowstones formed, for the measured ages to fit. The same arithmetic for the other South African caves is in The South African Australopiths. ↩ ↩
- 22.
Dirks, Paul H. G. M. et al. “Geological Setting and Age of Australopithecus sediba from Southern Africa.” Science 328(5975):205–208. Apr 9, 2010. The companion paper on the cave's geology and the first age estimate. It dates the flowstone under the fossils by uranium-lead in two laboratories, reads the magnetism of the flowstone and sediments, and brackets the age with the animals found in the deposit. ↩
- 22a.
Page 205: “cave is located 15 km north-northeast of Sterkfontein”. ↩
- 22b.
Page 205: “dolomite of the late Archaean [2.64 to 2.50 billion years ago (Ga)] Malmani Subgroup”. ↩
- 22c.
Page 205, section Abstract: “The two hominin specimens were buried together in a single debris flow that lithified soon after deposition in a phreatic environment inaccessible to scavengers.” ↩
- 22d.
Page 207: “These ages thus bracket the depositional age of the fossil hominins.” The bracket is the first African appearance of several species at about 2.36 million years and the last appearance of the extinct cat Megantereon whitei at about 1.5 million years. ↩
- 22e.
Page 205, section Abstract: “immediately above a flowstone layer with a U-Pb date of 2.026 ± 0.021 Ma. The flowstone has a reversed paleomagnetic signature and the overlying hominin-bearing sediments are of normal polarity, indicating deposition during the 1.95- to 1.78-Ma Olduvai Subchron.” Page 207: “The dates of 2.024 ± 0.062 Ma (Bern) and 2.026 ± 0.021 Ma (Melbourne) are identical within error and provide a maximum”. The dated seams lie 20 cm below the adult skeleton. ↩ ↩
- 22f.
Page 207: “The flowstone mainly preserves reverse polarity, but near its base, a normal polarity excursion occurs that is interpreted as the Huckleberry Ridge Subchron at 2.06 ± 0.04 Ma”. ↩
- 22a.
- 23.
Williams, Scott A. et al. “Malapa at 10: Introduction to the Special Issue on Australopithecus sediba.” PaleoAnthropology, 49–55. 2018. The introduction to a nine-paper special issue that gives full descriptions of most of the skeleton. It counts the material and summarises each paper and the debate. ↩
- 24.
Carlson, Kristian J. et al. “The Endocast of MH1, Australopithecus sediba.” Science 333(6048):1402–1407. 2011. A virtual cast of the inside of MH1's braincase, made from synchrotron scans. It describes the brain's surface pattern and argues that some reorganisation toward the human pattern came before any increase in size. ↩
- 24a.
Section Abstract: “reveals generally australopith-like convolutional patterns on the frontal lobes but also some foreshadowing of features of the human frontal lobes, such as posterior repositioning of the olfactory bulbs.” ↩
- 24a.
- 25.
Irish, Joel D. et al. “Dental Morphology and the Phylogenetic "Place" of Australopithecus sediba.” Science 340(6129):1233062. 2013. A comparison of 22 tooth-crown traits in MH1 and MH2 with eight other African hominin samples, followed by a cladistic analysis. It places sediba closest to A. africanus. ↩
- 26.
de Ruiter, Darryl J. et al. “Mandibular Remains Support Taxonomic Validity of Australopithecus sediba.” Science 340(6129):1232997. 2013. A description of new jaw material from both skeletons, arguing that sediba is a distinct species and not a late form of A. africanus. ↩
- 27.
DeSilva, Jeremy M. et al. “The Lower Limb and Mechanics of Walking in Australopithecus sediba.” Science 340(6129):1232999. 2013. A reconstruction of MH2's walk from the shapes of the hip, knee and ankle joints. The gait is a hypothesis from joint anatomy, not an observation. ↩
- 28.
Williams, Scott A. et al. “New fossils of Australopithecus sediba reveal a nearly complete lower back.” eLife 10:e70447. Nov 23, 2021. A description of two newly found lumbar vertebrae that fit MH2, with three-dimensional shape analysis and measurements of how the vertebrae are wedged. It finds a lower back curved for upright walking but leaves the size of the curve open. ↩
- 29.
MH1's minimum cranial capacity is 420 cc and it had reached "at least 95%" of adult brain size,1 so an adult's would be at most 420 / 0.95 = 442 cc. The figure is an upper bound on the adult size implied by MH1, not a measurement of an adult. ↩
- 30.
Gunz, Philipp et al. “Australopithecus afarensis endocasts suggest ape-like brain organization and prolonged brain growth.” Science Advances 6(14):eaaz4729. 2020. A CT study of eight A. afarensis skulls with a large comparative sample of living apes. It is cited here only for its chimpanzee brain-volume figure.
- 30a.
Comparative sample: Pan troglodytes adults, N = 240, mean endocranial volume 369 ml, SD 37. ↩
- 30a.
- 31.
Wood, Todd C. “Baraminology, the Image of God, and Australopithecus sediba.” Journal of Creation Theology and Science Series B: Life Sciences 1:6–14. Jul 8, 2011. Wood's reply to the four creationist critiques of his 2010 result. He argues that the objections from the image of God and from salvation fail, that Berger's own character list is biased against Homo, and that critics should run their own analyses; he also concedes the result rests on one data set.
- 31a.
Page 8: “For example, A. sediba and H. erectus share 51 character states out of the 69 listed, while A. sediba and A. africanus share only 33 character states (Table 1).” ↩ ↩
- 31b.
Page 11: “it is important to note that the position of Australopithecus sediba in the genus Homo, though strongly supported by the data used in my study, is only supported by one character set.” ↩
- 31c.
Page 11: “In contrast, the equal weighting scheme of statistical baraminology has an advantage, in that it uses “a suite of characters to define ‘human’” rather than reducing “humanness to cranial capacity, limb proportions, ... bipedality,” or any other specific characteristic that might have varied in the past (Wood 2010a).” ↩ ↩
- 31d.
Page 12: “If some creationists are uncomfortable with including A. sediba in the human holobaramin (which they certainly are), they ought to do their own statistical analysis to demonstrate discontinuity between A. sediba and members of the true human holobaramin (whatever species that might encompass).” ↩
- 31e.
Page 12: “At this point, however, preliminary results from an evaluation of postcranial characteristics for A. sediba are inconclusive (Wood 2010b).” ↩
- 31f.
Page 12: “If A. sediba descended from Adam, then he is human not animal. Likewise, australopiths like africanus or afarensis are animals. They did not evolve into humans, and they could not evolve the image of God.” ↩
- 31a.
- 32.
Pickering, Robyn et al. “U–Pb-dated flowstones restrict South African early hominin record to dry climate phases.” Nature 565:226–229. 2019. A study of 29 uranium-lead dates on flowstones from eight caves in the Cradle of Humankind. It finds that flowstone grew in six short wet intervals between 3.2 and 1.3 million years ago and that the fossils accumulated in the drier times between them.
- 32a.
Section Supplementary Information: “SED4 (1.82-2.00 Ma) sees sediments accumulating at Drimolen, Malapa, Sterkfontein Member 5 and Swartkrans Member 1.” Reference numerals after the site names are omitted. ↩
- 32a.
- 33.
Menton, David et al. “Sediba with a Little Sleight of Hand.” Answers in Genesis. Sep 14, 2011. Answers in Genesis's response to the September 2011 Science papers, by an anatomist, a geologist and a science writer. Its section on the date, which draws on the dating paper's supplement, is the only young-earth critique of the Malapa dating found.
- 33a.
Section Au. sediba, "Too Young to Date": “First, a reachable age goal had to be set. Then, the fossils needed to be re-dated to conform to expectations.” “which the “textbooks” teach, would automatically disqualify the data from providing any valid age information”. A footnote numeral after "teach" is omitted. “The date was obtained by comparison to the Huckleberry Ridge Tuff, which was itself dated using argon-argon dating.” “Thus, the whole process is quite circular, producing an attractive “precise” date of completely unknown accuracy.” ↩ ↩ ↩
- 33a.
- 34.
Line, Peter. “Australopithecus sediba revisited.” Creation Ministries International. Sep 15, 2011. Line's review of the five Science papers of September 2011.
- 34a.
Paragraph 1: “Australopithecus sediba still shows that it is not an apeman or missing link but likely to be another variety of australopithecine.” ↩
- 34b.
Paragraph beginning "In September 2011": “other creationists who have examined the method described in the paper to obtain the revised date note that “the whole process is quite circular, producing an attractive ‘precise’ date of completely unknown accuracy.”” Line's note 4 cites Mitchell, Menton and Snelling at Answers in Genesis. ↩
- 34a.
- 35.
Menton, David N. et al. “Baraminological Analysis Places Homo habilis, Homo rudolfensis, and Australopithecus sediba in the Human Holobaramin: Discussion.” Answers Research Journal 3:153–158. Aug 25, 2010. Three separately signed replies to Wood 2010, printed together: by David Menton of Answers in Genesis (pp. 153–155), the independent writer Anne Habermehl (pp. 155–156) and David DeWitt of Liberty University (pp. 156–158). All three reject the human placement, on different grounds.
- 35a.
Page 153: “Like other creationists who have commented on Australopithecus sediba (Line 2010; Thomas 2010 a, b), I do not agree that it is human, and neither do most evolutionists.” Menton's section. ↩
- 35b.
Page 153: “This is further complicated by the fact that these presumed “similarities” are the biased opinions of evolutionists.” Menton's section. ↩
- 35c.
Page 153: “In the case of Australopithecus sediba, there are only two published specimens (Berger et al. 2010). One is said to be a male (MH1) and the other a female (MH2). This presents a problem because there is a substantial sexual dimorphism in primate skeletal anatomy. To make matters worse, MH1 is a juvenile and MH2 is an adult.” Menton's section. The 2010 description itself judged the size difference between the sexes "slight." ↩
- 35d.
Page 155: “Will we now accept these obvious apes (such as Australopithecus sediba—and, yes, Wood is totally correct that this sure is a surprise) as human, because somebody’s manipulation of statistics tells us that we should do this?” Habermehl's section. She holds, following Jack Cuozzo, that the long-lived Neanderthals are the only early humans. ↩
- 35e.
Page 157: “Regardless of the bootstrap BDIST calculations, sediba should not be considered a human.” Page 158: “it would appear that the statistical baraminology results placing Homo habilis, Homo rudolfensis, and Australopithecus sediba within the human holobaramin is a false positive result.” DeWitt's section. ↩
- 35f.
Page 157: “Further, since sediba was found in South Africa, it is a descendant of Noah that made it quite some distance from anyone’s suggested location for the Tower of Babel.” DeWitt's section. ↩
- 35a.
- 36.
Hawks, John et al. “Comment on "Early Homo at 2.8 Ma from Ledi-Geraru, Afar, Ethiopia".” Science 348(6241):1326. 2015. A technical comment by three members of the sediba team, arguing that LD 350-1's comparison with sediba used wrong measurements. Its abstract reads: "When correctly used, these data demonstrate that specimen LD 350-1 cannot be unequivocally assigned to the genus Homo." ↩
- 37.
Villmoare, Brian et al. “Response to Comment on "Early Homo at 2.8 Ma from Ledi-Geraru, Afar, Ethiopia".” Science 348(6241):1326. 2015. The describers' reply. Its abstract reads: "Our reexamination of the evidence confirms that LD 350-1 falls outside of the pattern that A. sediba shares with Australopithecus and thus is reasonably assigned to the genus Homo." ↩
- 38.
Kimbel, William H. et al. “Systematic assessment of a maxilla of Homo from Hadar, Ethiopia.” American Journal of Physical Anthropology 103(2):235–262. 1997. The description of A.L. 666-1, an upper jaw found with stone tools 0.8 m below a volcanic ash dated by argon to 2.33 ± 0.07 million years. Its abstract attributes the jaw to "Homo aff. H. habilis," a looser identification than a firm species name. ↩
- 39.
Robinson, Chris et al. “Temporal ranges and ancestry in the hominin fossil record: The case of Australopithecus sediba.” South African Journal of Science 114(3/4):20170327. 2018. An estimate of how long hominin species last, about 0.97 million years on average, used to argue that one site's date cannot show when a species began. One author is a member of the sediba team. The authors say they are not arguing that sediba is the ancestor, only that dates alone cannot refute it.
- 39a.
Page 1, section Abstract: “As these scenarios are all equally plausible, and 2.95 Ma predates the earliest specimens that some have attributed to Homo, we cannot refute the hypothesis that the species A. sediba is ancestral to our genus based solely on currently available temporal data.” The scenarios place sediba's first appearance at 2.95, 2.47 or 1.98 million years, depending on where in its range the Malapa fossils fall. ↩ ↩
- 39a.
- 40.
Dembo, Mana et al. “Bayesian analysis of a morphological supermatrix sheds light on controversial fossil hominin relationships.” Proceedings of the Royal Society B 282:20150943. 2015. A dated Bayesian analysis of 380 skull and tooth characters across the hominins, testing Berger's four proposed positions for sediba. The best-supported tree makes sediba the sister group of all Homo. Mirror: PMC
- 40a.
Page 4: “Thus, the Au. sediba lineage must be at least 300 000–500 000 years older than the current hypodigm suggests, and may be as much as 800 000 years older.” The page number is the PDF page of the accepted version. ↩
- 40a.
- 41.
Mongle, Carrie S. et al. “An updated analysis of hominin phylogeny with an emphasis on re-evaluating the phylogenetic relationships of Australopithecus sediba.” Journal of Human Evolution 175:103311. 2023. A re-scoring of the skull and tooth characters of sediba with attention to MH1's youth, analysed by parsimony and Bayesian methods.
- 41a.
Section Abstract: “we could not reject the hypothesis that A. sediba shares its closest phylogenetic affinities with the genus Homo. Therefore, based on currently available craniodental evidence, we conclude that A. sediba is plausibly the terminal end of a lineage that shared a common ancestor with the earliest representatives of Homo. We caution, however, that the discovery of new A. sediba fossils preserving adult cranial morphology or the inclusion of postcranial characters may ultimately necessitate a re-evaluation of this hypothesis.” ↩ ↩
- 41a.
- 42.
Rak, Yoel et al. “One hominin taxon or two at Malapa Cave? Implications for the origins of Homo.” South African Journal of Science 117(5/6):8747. 2021. A shape analysis of the rising branch of the lower jaw in MH1 and MH2, compared with 115 modern human, chimpanzee and orangutan jaws and a few fossils. It argues that the two skeletons belong to two genera and that sediba therefore cannot be an ancestor of Homo.
- 42a.
Page 1, section Abstract: “According to our results, the specimens represent two separate genera: Australopithecus and Homo.” ↩ ↩ ↩
- 42b.
Page 5: “MH2 falls in the generalised group (assigned as most likely an orangutan, with p(ki) = 0.76), whereas MH1 is assigned as most likely Australopithecus (p(ki) = 1.00).” The "generalised" group is the jaw shape the authors find in modern humans, chimpanzees, bonobos and orangutans. ↩
- 42a.
- 43.
Ritzman, Terrence B. et al. “Mandibular ramus shape of Australopithecus sediba suggests a single variable species.” Journal of Human Evolution 100:54–64. 2016. A comparison of the jaw-branch shapes of MH1 and MH2 with variation inside living gorillas, chimpanzees, orangutans and humans, testing whether the difference reflects age, sex or two taxa.
- 44.
Line, Peter. “Developments in paleoanthropology no. 3.” Creation Ministries International. Jun 28, 2024. A survey that reports the 2021 two-genera paper on the Malapa jaws and the 2022 reply.
- 45.
Line, Peter. “Sediba: New alleged hominid ignites debate, but is no missing link.” Creation Ministries International. Apr 13, 2010. The first young-earth response to the 2010 description, by a Creation Ministries International writer on human origins.
- 45a.
Paragraph beginning "The above contrary opinions": “The above contrary opinions may well be resolved if Australopithecus sediba is a small-brained specimen of the type evolutionists have often classified as Homo habilis.” Line adds that Homo habilis is commonly regarded as an invalid taxon whose members belong in Australopithecus. ↩
- 45a.
- 46.
Thomas, Brian. “A New Evolutionary Link? Australopithecus sediba Has All the Wrong Signs.” Institute for Creation Research. Apr 15, 2010. An ICR news article published a week after the species was named.
- 46a.
Paragraph 1: “But the remains of this extinct ape provide several solid clues that contradict any evolutionary relationship to man.” ↩
- 46a.
- 47.
Line, Peter. “Gautengensis vs sediba: a battle for supremacy amongst 'apeman' contenders, but neither descended from Adam.” Creation Ministries International. Jun 15, 2010. Line's reply to Wood's 2010 baraminology paper.
- 47a.
Section on Wood's baraminology: “Wood's analysis at best raises issues for further investigation, and certainly does not warrant sweeping conclusions that effectively extend the range of human variation to apish creatures swinging in trees like Tarzan.” ↩
- 47a.
- 48.
Lubenow, Marvin L. “The Problem with Australopithecus sediba.” Answers in Depth 5. Aug 11, 2010. A short essay by the author of Bones of Contention, the standard young-earth book on human fossils, arguing that sediba is a variety of ape and too young to be a human ancestor.
- 48a.
Section final section: “The most parsimonious explanation regarding Australopithecus sediba is that it and Australopithecus africanus are both extinct varieties of the original Genesis ape kind.” ↩
- 48a.
- 49.
Wood, Todd C. “Lubenow on sediba.” Todd's Blog. Aug 13, 2010. Wood's blog reply to Lubenow's essay.
- 49a.
“Since I don't think sediba is an ape, I must not be a biblical creationist.” ↩
- 49a.
- 50.
Wood, Todd C. “Sediba, the bad, and the ugly.” Todd's Blog. Aug 24, 2010. Wood's blog response to the five creationist critiques of 2010.
- 50a.
“all five of the sediba critics are absolutely, positively convinced that it isn't human”. ↩
- 50a.
- 51.
Wood, Todd Charles. “An Evaluation of Homo naledi and "Early" Homo from a Young-Age Creationist Perspective.” Journal of Creation Theology and Science Series B: Life Sciences 6:14–30. 2016. Wood's analysis of Homo naledi, which also reruns his method on a second, larger skull-and-tooth data set that includes sediba.
- 52.
Thomas, Brian. “Evolutionary "Game Changer" Doesn't Change Anything.” Institute for Creation Research. Nov 30, 2011. An ICR essay on the 2011 Science papers.
- 52a.
Section closing paragraphs: “It was not a transition toward man, but an extinct ape kind.” ↩
- 52a.
- 53.
O'Micks, Jean. “Homo naledi Probably Not Part of the Human Holobaramin Based on Baraminic Re-Analysis Including Postcranial Evidence.” Answers Research Journal 9:263–272. 2016. A creationist baraminology study that adds 37 postcranial characters, weighted by hand, to an analysis of Homo naledi, with sediba among the comparison taxa.
- 53a.
Page 271: “Similarities between these two species in the structure of the upper limb, thorax, and feet suggest that they might be similar, if not the same species of australopithecine.” ↩
- 53a.
- 54.
O'Micks, J. “Likely Discontinuity Between Humans and Non-Human Hominins Based on Endocranial Volume and Body Mass With a Special Focus on Homo naledi: A Short Analysis.” Answers Research Journal 10:241–243. 2017. A short creationist analysis that clusters fourteen hominin species by average brain volume and body mass. It is a crude measure, two numbers per species.
- 54a.
Section Results: “The second cluster is made up of Homo habilis, Homo naledi, Australopithecus sediba, Australopithecus africanus, Australopithecus afarensis, Paranthropus boisei, Paranthropus aethiopicus, and Ardipithecus ramidus.” ↩
- 54a.
- 55.
Thomas, Brian. “Anthropologist Wows Scientists.” Institute for Creation Research. Jun 27, 2022. An ICR report on a talk by the paleoanthropologist Jeremy DeSilva. Its footnote for the mixture claim is a 2014 New Scientist news story. The article is reproduced on ICR's fossilization topic page.
- 55a.
“Now, enough have been published to reveal sediba as just a mixture of bones from different creatures.” “Australopithecus sediba wasn't a real creature. It's just a mixture of human and ape bones that never belonged together.” ↩
- 55a.
- 56.
Nalin, Ronny. “Review of Contested Bones.” Geoscience Research Institute. 2018. A review of Rupe and Sanford's book by a geologist at the Seventh-day Adventist Geoscience Research Institute, sympathetic to the book's aims and critical of its sediba chapter. It is the only creationist review of the book found.
- 56a.
“Bones of the Au. sediba MH2 right wrist and hand were uncovered in a cluster and in close association with the remainder of the right upper limb.” Nalin is quoting the supplementary material of Kivell and colleagues' 2011 paper on the hand. ↩ ↩
- 56b.
“If each partial skeleton indeed comes from a single individual, there would be no other option but to admit that “mosaic” forms are represented in the hominin fossil record, a conclusion Rupe and Sanford seem to resist.” “none of Berger's et al. original publications seem to contain a diagram showing the spatial representation of individual fossil fragments positioned where they were encountered during excavation.” ↩ ↩ ↩ ↩ ↩
- 56a.
- 57.
Wood, Todd C. “Hominins: Was I wrong????” Todd's Blog. Nov 3, 2021. Wood's plain-language summary of the 2021 reanalysis with Sinclair.
- 57a.
“None of this work proves me right or proves that Au. sediba is human or that Homo naledi is human. I simply failed to falsify my original conclusions that Au sediba and Homo naledi were human.” ↩
- 57a.
- 58.
Line, Peter. “Developments in paleoanthropology 2.” Journal of Creation 36(1):89–98. 2022. A survey of recent hominin finds for a young-earth readership, including the 2021 lumbar vertebrae of MH2.
- 59.
Rupe, Christopher. “"Lucy" and the Pygmy Human Hypothesis.” Creation Research Society Quarterly 62:208–227. 2026. Rupe's argument that Lucy was a small-bodied human and that human bones have been misfiled as Australopithecus. It is cited here for what it now says about the sediba pelvis and shoulder.
- 59a.
Page 220: “Indeed, it may therefore be another example of a misclassified human pelvis (Figure 13).” Figure 13 caption: “Examples of potentially misclassified human pelvises. Left to right: Lucy (A.L. 288-1); Au. africanus (STS 14); Au. sediba (MH 1/MH 2 composite).” ↩
- 59b.
Page 220: “The iliac blades of Au. sediba are described as more derived compared to other australopiths, in that they are less flared and more vertically oriented, as in later Homo (Kibii et al., 2011).” ↩
- 59c.
Page 221: “Note that the anatomical association of the MH 2 scapula with a morphologically human hand strongly suggests the scapula is also human.” Rupe gives the MH2 shoulder joint angle as 131.6°, against 132.3° for Lucy, 142.3° for modern humans and 127.8° for chimpanzees. ↩ ↩
- 59a.
- 60.
Berger, Lee R. et al. “Homo naledi, a new species of the genus Homo from the Dinaledi Chamber, South Africa.” eLife 4:e09560. 2015. The type description of Homo naledi, by the excavating team. It is cited here only for the brain size of the species Wood counts as the smallest-brained human. Mirror: PMC
- 60a.
Section Description: “H. naledi has a range of body mass similar to small-bodied modern human populations”. Endocranial volumes of about 560 and 465 cc for the two composite crania. ↩
- 60a.
- 61.
Reeves, Colin R. “A Critical Evaluation of Statistical Baraminology: Part 1, Statistical Principles.” Answers Research Journal 14:261–269. 2021. A creationist's critique of the statistics behind Wood's baraminology, published in Answers in Genesis's own research journal. It prompted Sinclair and Wood's 2021 reanalysis.
- 61a.
Page 261, section Abstract: “This paper will argue that these methods are based on a shaky understanding of statistical principles, and that their use ought to be abandoned.” ↩
- 61a.
- 62.
“What date would you like?” Creation 45(2):10. Apr 2023. An unsigned news item in Creation Ministries International's magazine about the South African cave dates. It states plainly where the ministry places the australopith caves in time.
- 62a.
Paragraph 2: “The caves formed late in Noah's Flood some 4,500 years ago. The remains of these apish primates at Sterkfontein (australopithecines) were interred after the Flood after the animals had dispersed into the area from the Middle East.” ↩
- 62a.
- 63.
Hardy, Chris, and Robert Carter. “The biblical minimum and maximum age of the earth.” Journal of Creation 28(2):89–96. 2014. A young-earth paper that works out the earliest and latest dates the biblical numbers allow for creation and the Flood, across the Masoretic, Samaritan and Septuagint texts.
- 63a.
Page 96: “The Flood probably occurred between 2600 bc and 2300 bc, but certainly between 3386 bc and 2256 bc (table 5).” ↩
- 63a.