Rejecting a claim from publication and erasing it from the record are two different decisions. This page is the record.
What this page is
Four numbers and attributions in circulation on the bioturbation question did not survive contact with the sources they name. None of them appears in the article. None of them has been deleted either, because a later researcher with a university proxy may be able to settle two of them in an afternoon.
Three status words are used.
- REFUTED — somebody opened the named source and the claim is not in it. A better copy will not help.
- UNVERIFIABLE — no route to the named source has been found yet. That is a statement about this project's reach, not about the claim. "I could not find it" is not "it does not exist."
- MISUSED — the text is real and correctly attributed, and quoting it the usual way would overstate what its source says.
A standing rule applies to every entry. Nothing here was established with Claude's WebFetch tool, which converts a page to markdown and answers through a small summarising model that can paraphrase without saying so. Every check below was run on downloaded bytes: curl for PDFs and web pages, bin/iapdsearch.py and archive.org's fulltext/inside.php for books and microfilm, _scandata.xml for leaf-to-folio maps.
1. "Woodmorappe's Studies in Flood Geology shows that bioturbation is rare and shallow in the column"
Status: REFUTED.
Claim as it circulates. That John Woodmorappe's Studies in Flood Geology: A Compilation of Research Studies Supporting Creation and the Flood (2nd edition, Institute for Creation Research, El Cajon, 1999) argues that bioturbation in the geological column is rare and shallow, and is therefore evidence for rapid deposition.
What was tried. The book is on archive.org as the print-disabled item studiesinfloodge0000wood, which cannot be borrowed. It was read through the search-inside route, which returns whole paragraphs. Leaf-to-folio from _scandata.xml: printed page = leaf − 6, anchored at leaf 100 = p. 94 and leaf 221 = p. 215. A full sweep was run for "bioturbation", "trace fossil" and "burrow".
What was found. Three relevant passages, and none of them makes the claim.
- Page 140, section 15, "Mixing of Trace Fossil Assemblages and Sediment Type": "It is commonly taught that trace fossil assemblages show an ichnofacies zonation due to organisms having inhabited different regions of a sedimentary environment. … The statements of Chamberlain and Seilacher indicate that the ichnofacies zonation is sometimes mixed. Such zonation therefore is not exact and need not imply the onetime presence of analogs of modern environments. The overlap and even mixing of ichnofacies may have resulted from organisms of different subenvironments having become mixed during Flood deposition."
- Page 211: "A great deal of bioturbation (as traced fossils: 'worm burrows, raindrop prints, worm trails,') can be explained as bubble imprints."
- Page 215, in tables: bioturbation is listed among structures attributable to "fluctuations of water velocity" and "slumping (tectonic?)".
The book offers no rate data, no ichnofabric survey, and no time estimate. Its argument about trace fossils is that they may not diagnose environments, and that some of them may not be biogenic at all.
Where the rare-and-shallow claim actually belongs. To Snelling 2009 p. 740, and to Brand and Chadwick's survey. Woodmorappe's own 2006 Journal of Creation paper concedes the opposite for the Cambro-Ordovician, and cites this 1999 book exactly once, at his note 17, for the bubble-imprint point.
What would change the verdict. A page reference in the 1999 book, or in the 1st edition, carrying the claim. The sweep above found none.
2. "Brand and Chadwick surveyed 37 formations and found 97% of the thickness unbioturbated"
Status: UNVERIFIABLE.
Claim as it circulates. The fullest version recorded in this project's own notes comes from a Paul Garner social-media summary: "Leonard Brand and Art Chadwick systematically surveyed 37 sedimentary formations in the western US, spanning the Cambrian to the Eocene … 97% of the thickness showed no bioturbation or occasional isolated burrows … <1% being thoroughly bioturbated."
Why it matters. If it is a real measurement it is the strongest quantitative young-earth result on this question, and it would sit directly against Droser and Bottjer's finding that the majority of 1,151 metres of Cambrian shelf carbonate is at ichnofabric index 3 or above. Two young-earth authorities would then be describing the same column in incompatible numbers, which is a fact worth printing on its own.
What was tried. The survey is described in Faith, Reason, & Earth History, 3rd edition, chapter 18, which is on disk as an EPUB and was read in full for that chapter. Searches were run for a CRSQ, Origins, International Conference on Creationism or Geological Society of America abstract version of the survey.
What was found. The book describes the survey and gives no percentage at all, and no formation count. Its statement is qualitative: "the vast majority of vertical intervals in all deposits surveyed had no bioturbation or a small amount (level 1), not enough to noticeably disturb the bedding." Their scale is their own 0 to 4, not the standard 1 to 6 ichnofabric index, so even a published percentage would need a stated conversion before it could be compared with anybody else's.
What would change the verdict. A published Brand and Chadwick bioturbation paper carrying the numbers. Origins, the Geoscience Research Institute journal, is the most likely venue and was not exhaustively searched. Until one is found, the figure is not a measurement this article can cite, and the book's qualitative sentence is used instead.
3. "Spatangoid urchins rework the top 5 cm of sediment in three days"
Status: MISUSED. (Was UNVERIFIABLE; resolved 2026-09-05. The paper's abstract and published section snippets were obtained, and the depth figure is still unaccounted for.)
Claim as it circulates. Snelling 2009 and Woodmorappe 2006 both give it, citing Lohrer, A.M., S.F. Thrush, L. Hunt, N. Hancock and C. Lundquist, "Rapid reworking of subtidal sediments by burrowing spatangoid urchins," Journal of Experimental Marine Biology and Ecology 321:155–169, 2005. Both give the volume and page range correctly, so this is not a citation error.
What was tried. The paper is closed on Elsevier. Crossref and Semantic Scholar return records whose abstracts are elided by the publisher. No archive.org microfilm run of JEMBE covers 2005.
What was found. Only a secondary summary indicating that the paper is a model parameterised with field data from six New Zealand sites, and that foraging Echinocardium cordatum displaces 60 to 150 times more sediment than it ingests. That is a different statement from "the top 5 cm in three days," and it cannot be used to confirm the figure.
Why it is not printed. The article's argument turns on rates, so a rate figure has to be read in its original with its conditions attached. This one has not been. The article uses the rate figures it could verify: Gingras and colleagues 2008 by abstract, and Grimm and Föllmi 1994 in full.
Resolved 2026-09-05. bin/cdp-fetch.py page on the ScienceDirect record S0022098105000821 returned the full abstract and Elsevier's published section snippets, read from the saved bytes. (Plain curl 403s; archive.org's microfilm run of this journal stops at volume 282, 2003; OpenAlex, Unpaywall, Semantic Scholar, CORE, BASE and SFU Summit all report it closed. The journal is JEMBE, not Marine Ecology Progress Series, so the open int-res.com archive does not apply.) What the abstract says: the study is "a mathematical model" of Echinocardium australe parameterised with field data from six northern New Zealand sites; the movement-rate parameter came "from one time and place only (Site OB5)"; OB5 "had the highest sediment reworking rate of all sites," so the model "yielded a good upper bound estimate"; and "The volume of sediment displaced by Echinocardium populations reached 20,000 cm³ m⁻² d⁻¹ at OB5, suggesting that surface sediment is reworked about every 3 days at sites where Echinocardium is abundant." The same abstract adds: "Experimental work with a fluorescent tracer at OB5 suggested limited downward particle movement as a result of Echinocardium bioturbation."
What is confirmed and what is not. The three-day figure is real, and it is a modelled upper bound at the single best of six sites, not a general rate. No "5 cm" appears in the abstract or in any of the four section snippets. 20,000 cm³ per square metre per day is a 2 cm layer per day, so three days is about 6 cm, which is the right order; but the depth Snelling and Woodmorappe print is not in the part of the paper that could be read, and where they got it is unknown. The article now uses the abstract with those qualifications attached rather than repeating the creationist paraphrase.
What would still change the verdict. The Lohrer 2005 full text, through a university proxy or interlibrary loan, to find the sentence that carries a depth.
4. "Some organisms burrow at 1,000 cm per hour"
Status: MISUSED.
Claim as it circulates. Snelling 2009 gives the figure at the foot of p. 918, running over to p. 919, in a list of rapid burrowing rates: "other organisms can produce burrows as rapidly as 1,000 cm per hour, although the usual rate is much slower." It is footnoted to Howard & Elders 1970, Kranz 1974 and Stanley 1970 without page-level attribution. (Verified from bytes 2026-09-05: volume-2.pdf PDF pages 465 and 466.)
What was found. The figure reads as a burrowing speed, the distance an animal moves through sediment, not a reworking rate, the volume of sediment a population turns over. Those are different quantities and only the second bears on how long a bed takes to lose its bedding. A razor clam moving through sand at high speed displaces a burrow's worth of sediment, not a bed's worth. The primaries were not obtained, so the figure itself is neither confirmed nor refuted; what is rejected is its use as a bed-reworking rate.
What would change the verdict. The three primaries, read at the pages that carry the figure, plus a statement of what quantity is being measured. If it is a linear speed, it stays out of any time calculation.
Not quarantined, and why
Snelling's "5.5 hours." This is printed in the article, with its correction, because the error is checkable end to end and the chain of custody is the point. Snelling 2009 p. 919 gives 5.5 hours; his source Woodmorappe 2006 p. 116 gives 15.5; the primary, Grimm & Föllmi 1994 p. 328, gives 15.5 as the shortest of a range reaching 4,020 hours. All three documents were read. A transcription slip is not a quarantine case, and the substantive defect, the omitted upper bound, is reported in the body.
Verifier log 2026-09-05
Running record. Appended as each check completes, so a kill loses nothing.
Snelling 2009, chain of custody — CONFIRMED from bytes. sources/books/snelling-2009_earths-catastrophic-past/volume-2.pdf, PDF page 466 = printed 919 (running head "Bioturbation, Hardgrounds, and Trace Fossils 919"; PDF 464 = 917, 465 = 918, 467 = 920). p. 919 verbatim: "Indeed, depending primarily upon the density of fast-burrowing organisms such as callianassid shrimp, a 12-cm-thick layer of sediment can be 67 percent bioturbated in as little as 5.5 hours." p. 917 clock quote confirmed verbatim. p. 740 (PDF 287, running head "740 Earth's Catastrophic Past") "so little bioturbation" quote confirmed verbatim.
New detail found while checking. The "5.5 hours" sentence carries Snelling's note 6 (Howard & Elders 1970; Kranz 1974; Stanley 1970), and the indented Grimm & Föllmi block that follows carries note 7 (Grimm & Föllmi 1994, Palaios 9:328). So Snelling does cite the primary at the right page for the block quotation; the corrupted numeral is in his own sentence. The urchin claim and the 1,000 cm/hour claim both begin on p. 918, not 919: "certain urchins are known to rework the upper 5 cm of sediment in three days.5" (note 5 = Lohrer and others 2005) and "other organisms can produce burrows as rapidly as 1,000 cm per hour, although the / usual rate is much slower.6". Quarantine entry 4's locator corrected below.
Woodmorappe 2006 — CONFIRMED, two locators corrected. sources/papers/woodmorappe-2006b_soft-sediment-trace-fossils-time-problem.pdf, printed page = PDF page + 112 (PDF 1 = 113, PDF 10 = 122, checked at both ends). p. 116 verbatim: "Moreover, depending primarily upon the density of fast-burrowing organisms such as callianassid shrimp, a 12-cm thick layer of sediment can be 67% bioturbated (ichnofabric index of ~5, figure 1) in as little as 15.5 hours:" (the PDF sets "12‑cm" with a non-breaking hyphen). p. 119 verbatim for the 48-sections / 1,151-metre concession, the "more of a challenge" sentence, the "cryptically composite" sentence and the "at least partly illusory" sentence. Two locator errors fixed in index.md: "The efficacy of the PPLC hypothesis requires experimental validation" is on p. 120, not 119; note 103 (the 8,766 / 4,383 hour budget with the "extreme; intentionally so" caveat) is in the reference list on p. 122, not 120.
Grimm & Föllmi 1994 — CONFIRMED. archive.org sim_palaios_1994-08_9_4, search-inside. _scandata.xml gives leaf 10 = p. 319 and leaf 25 = p. 334, so leaf 19 = p. 328 and leaf 4 = p. 313; both anchors are far apart and agree. Leaf 19 returns, verbatim: "Estimated durations range from 15.5 to 4020 hours (~1 day to 24 weeks)…"; "…= 15.5 hours (this method yielded the shortest estimated duration)"; the 1073-hour Suchanek & Colin (1985) alternative; "Total sediment volume = (area) x (thickness); = 100 cm x 100 cm x 12 cm = 120,000 cm³"; and "Burrow volume measured on serial slabs cut through the bed parallel to bedding (67 + 2%; n = 250 counts)." Leaf 4 returns the abstract sentence quoted at p. 313. Every Grimm locator in the article is right.
The article's 283-surface arithmetic — CHECKED. 4,383 ÷ 15.5 = 282.8, rounded to 283; 283 × 12 cm = 33.96 m, printed as "about 34 metres". The alternatives check too: 4,383 ÷ 1,073 = 4.1 surfaces ≈ 0.49 m, and 4,383 ÷ 4,020 = 1.1 surfaces. The body labels the calculation as this article's and quotes Woodmorappe's "extreme; intentionally so for the purpose of illustration" caveat in full.
Gingras et al. 2008 — still abstract-only, and the parent's premise corrected. The paper is Palaeogeography, Palaeoclimatology, Palaeoecology 270(3–4):280–286, doi 10.1016/j.palaeo.2008.07.015, not Journal of Sedimentary Research; Froede 2009's own reference 2 gives the PPP citation. Routes tried on 2026-09-05: OpenAlex (oa_status: closed, no repository location), Unpaywall (is_oa: false, zero OA locations), Semantic Scholar (openAccessPdf.status: CLOSED, abstract elided by the publisher), CORE v3 search, BASE, SFU Summit, University of Alberta ERA, and a title-plus-"pdf" web search. Nothing but the abstract exists in the open. The abstract itself was re-confirmed word for word by curling kirjandus.geoloogia.info/en/reference/6966 and stripping tags locally, and it agrees with Froede 2009's block quotation. Two corrections made to index.md: the ichnofacies names are printed without square brackets by both routes, so the article now italicises them instead of bracketing them, and the footnote's claim that the brackets were in the source was wrong and is removed. Froede's copy drops "the" from "Under the maximum population densities modeled"; the publisher-derived copy keeps it, and that is what the article prints.
Lohrer et al. 2005 — OBTAINED (abstract plus published section snippets), quarantine entry 3 resolved. It is Journal of Experimental Marine Biology and Ecology 321(2):155–169, doi 10.1016/j.jembe.2005.02.002 (Crossref), not Marine Ecology Progress Series, so the int-res.com open-archive route does not apply. archive.org's sim_journal-of-experimental-marine-biology-and-ecology_* microfilm run stops at volume 282 (2003), so 2005 is not there. Plain curl on ScienceDirect returns 403. bin/cdp-fetch.py page on https://www.sciencedirect.com/science/article/abs/pii/S0022098105000821 returned the full abstract and Elsevier's published section snippets for Introduction, Study organism, Field surveys and Discussion. Bytes saved and read locally; no metered account used. The full text is still behind the paywall.
Baldwin 2004 and Hagadorn 2011 — abstracts obtained, no index figure exists in either. Baldwin and colleagues 2004 is not in Palaios; it is Geological Society, London, Special Publications 228:213–236, doi 10.1144/GSL.SP.2004.228.01.11, so the sim_palaios microfilm route does not apply. Routes tried: Crossref (returned the publisher's deposited abstract), OpenAlex (closed, one dead CiteSeerX location, abstract reconstruction agrees word for word with Crossref), bin/cdp-fetch.py on the DOI (Crossref multiple-resolution chooser), on lyellcollection.org/doi/10.1144/GSL.SP.2004.228.01.11 (title only, paywall), and on the GeoScienceWorld redirect handler (bounced to an unrelated record). The abstract carries no ichnofabric or bioturbation index. It does carry a useful primary sentence, now quoted in the Grand Canyon section: "trace fossils and palynomorphs are abundant throughout the formation."
Hagadorn and colleagues 2011, Museum of Northern Arizona Bulletin 67:63–77, has no DOI and is not in Crossref or OpenAlex. archive.org holds no MNA Bulletin 67; CaltechAUTHORS has nothing on the Tapeats despite Kirschvink's authorship; the DMNS publication list 403s; academia.edu record 90773111 renders a GROBID-extracted abstract that is truncated mid-sentence ("Facies Suite B contains abundant Arenicolites trace fossils and rare 63 … Read more") and gates the PDF behind a login. Nothing quotable was recovered, and nothing numeric. The academia.edu page's "Key takeaways" and FAQ blocks are machine-generated and were not used.
Result for the Grand Canyon section: no ichnofabric or bioturbation-index figure for the Tapeats, Bright Angel or Muav exists in any source reachable from here. Miller and colleagues 2020, the fullest published compilation, contains the string "ichnofabric" zero times. Dehler and colleagues 2024 use "bioturbated sandstone" as a mappable facies and name a "Diamond Bar non-bioturbated sandstone member," which is member-scale presence and absence, not an index. The article's stated gap is correct and stays.
Verifier log 2026-09-06 (resumed after usage-limit kill)
Tools. bin/quote-provenance.py — 185 quotations, 174 traced, 11 untraced; all 11 examined and none is a defect: two are frontmatter fields (description, headerStyle), two are footnote link titles, two are this article's own prose inside quotation marks, and five are the Lohrer 2005 and Baldwin 2004 abstract quotations that the previous verifier added after the dossier was closed. bin/quotecheck.py — PASS 3, FAIL 2, SKIP 57. Both FAILs are two-column-PDF artefacts and both quotations are confirmed from the bytes on disk (see below).
Lohrer et al. 2005 — CONFIRMED from the saved bytes. sources/web/lohrer-2005_rapid-reworking-spatangoid-urchins.md. All four abstract fragments are verbatim: "from one time and place only (Site OB5)", "had the highest sediment reworking rate of all sites", "a good upper bound estimate", the 20,000 cm³ m⁻² d⁻¹ / 3-day sentence and the fluorescent-tracer sentence. The article's claim that no "5 cm" figure appears in the abstract or the section snippets is correct; the nearest is Bromley's "as deeply as 15-20 cm" in the introduction, which is burrow depth, not a reworked-layer thickness.
Baldwin et al. 2004 — CONFIRMED from the saved bytes. sources/web/baldwin-2004_palaeoecology-bright-angel-shale.md. Both quoted sentences verbatim in the publisher's deposited abstract.
Tarhan et al. 2025 — CONFIRMED, all fifteen quotations and every numeral. sources/papers/tarhan-2025_tracking-bioturbation-through-time.md. The Devonian sentence reads in full "86% of strata in this 430-m succession are unbioturbated; 7% are characterized by BI 2, 7% by BI 4, and <1% by BI 5", in the section "Middle to late Paleozoic sediment mixing", on the Reggane Basin, Algeria, exactly as the article states.
Wise 2018 — CONFIRMED, one locator corrected. sources/papers/wise-2018b_fossil-grove-allochthonous-flood-deposits.pdf, read per page with pdftotext -layout -f N -l N; PDF 15 = printed 251, PDF 16 = 252, PDF 17 = 253 by the running heads. Criterion 5 is on p. 251 as stated, and criterion 7 of the summary list on p. 252 as stated. Fixed: "the preservation of original depositional laminae in Unit B and the corresponding lack of bioturbation is most consistent with allochthony" is on p. 252, not 253 — it is the seventh item in the run of criteria applied to Fossil Grove, in the second column of p. 252.
Miller et al. 2020 — CONFIRMED, all five locators, and the pagination trap is real. Two documents with the same text and different pagination exist. The standalone chapter PDF in the library (sources/papers/miller-2020_paleozoic-invertebrate-ichnology-grand-canyon.pdf, from irma.nps.gov/DataStore/DownloadFile/637950) is 55 pages and carries printed folios 277–331; the Utah Geological Association Special Publication 1 volume (npshistory.com/publications/grca/uga-sp1.pdf, 465 pages) sets the same chapter in two columns at printed 131–170, where volume PDF page = printed page + 90. The offset between the two paginations is not constant (149, 151, 152 at three sampled points), so they cannot be converted. The article cites the UGA volume pages, and every one checks: p. 131 the 21-ichnogenera sentence, p. 138 both Tapeats sentences (column 1), p. 149 the Cruziana Ichnofacies passage (column 2), p. 152 the Muav mottling sentence. Verified by cropping each column with pdftotext -layout -x/-y/-W/-H; a plain extraction interleaves the columns and hides four of the five.
Droser & Bottjer 1986, 1988 and 1989 — CONFIRMED, every quotation and every page. All three read with bin/iapdsearch.py on the archive.org microfilm items, and all three leaf-to-folio maps re-derived independently from _scandata.xml rather than taken from the dossier: sim_journal-of-sedimentary-petrology_1986-07_56_4 leaf 91 = p. 558 and leaf 92 = p. 559; sim_geology_1988-03_16_3 leaf 42 = p. 233, 43 = 234, 44 = 235; sim_geology_1989-09_17_9 leaf 77 = p. 850, 78 = 851, 79 = 852. All six ichnofabric index definitions are verbatim, ii 1 to ii 4 on p. 558 and ii 5 and ii 6 on p. 559, exactly as the footnote states. The 810 m / 34 sections and 341 m / 14 sections sentences are verbatim on pp. 234 and 235, so the "1,151 total metres" and "48 sections" that Woodmorappe cites really are the sum of these two. The 1989 average-ichnofabric-index sentence (1.02 → 3.1 → 4.5) is verbatim on p. 851. Two quotations that a first pass reported absent were present and hyphenated across a line break ("biotur- bation", "contin- uous logging"); neither is a defect.
Bromley 1990 — CONFIRMED, all four quotations. tracefossilsbiol0000brom (printdisabled) via bin/iapdsearch.py; leaf-to-folio re-derived from _scandata.xml, printed page = leaf − 16, checked at leaf 128 = p. 112 and leaf 250 = p. 234. Stress factors p. 202 (leaf 218), tiering p. 190 (leaf 206), opportunists p. 204 (leaf 220), and the figure 11.14 caption p. 204 (leaf 220).
Boudreau 1994 — CONFIRMED, and one transcription defect fixed. sim_geochimica-et-cosmochimica-acta_1994-02_58_4 via bin/iapdsearch.py; leaf 10 = p. 1243, leaf 13 = p. 1246, leaf 14 = p. 1247. All three quotations verbatim at the stated pages. Fixed: the article printed the worldwide mean as "9.8 + 4.5 cm" in two places in the body, following the microfilm OCR. The OCR renders every plus-minus sign as a plain "+" — the same scan gives "standard deviation of +4.5 cm" on p. 1247, where the meaning is unambiguous — so the sign is restored to "±" in the body and the footnote now says why.
Froede 2009, Froede 2022, Arment 2023, Isaacs 2022 and Gingras 2008 — CONFIRMED from the saved copies in sources/web/. Gingras prints "115 yr" and "61 min", which the article's footnote quotes exactly and its body converts to "115 years" and "61 minutes" outside quotation marks.
Zhang et al. 2017, Brand & Chadwick, Whitmore & Garner 2008, Oard 2010, Snelling p. 921 and p. 740 — CONFIRMED. Zhang's seven bioturbation-index definitions, the four-tier depth scheme and the 170 cm / 3.1 cm / 32.4 cm figures are all verbatim in sources/papers/zhang-2017-…md. Brand and Chadwick's survey paragraph and the one-hour-to-one-year homogenisation sentence are verbatim in OEBPS/aup-brand3-0024.xhtml of the library EPUB. Whitmore and Garner's bioturbation criterion is verbatim on p. 430 (PDF page 6, second column) — the footnote now carries that page, which it previously lacked. Oard's two sentences are on pp. 91 and 90 as stated, read with pdftotext -raw because -layout interleaves a figure box through the column. Snelling p. 921 hardgrounds and p. 740 "at least a few hours" are verbatim.
Links — 18 URLs, all live, one DOI corrected. Every DOI was resolved through the Crossref API and its title, container, volume and page range compared with the footnote. Fixed: the Boudreau 1994 DOI in index.md was 10.1016/0016-7037(94)90381-6, which is a different Geochimica paper, "Surface area control of organic carbon accumulation in continental shelf sediments," at pp. 1271–1284. The correct DOI is 10.1016/0016-7037(94)90378-6, Geochimica 58(4):1243–1249, which is what the research dossier had all along; the typo was introduced when the footnote was written. Three URLs answer 403 or 405 to an unauthenticated request — GeoScienceWorld for the two Geology DOIs and science.org for Science Advances — which is publisher bot-blocking, not a dead link; all three resolve correctly in Crossref and all three are already marked paywalled in their footnotes.
Structure. 93 footnote keys defined, 93 used, no orphans either way. No hard-wrapped prose. The only em dashes in the body are the attributions in the three pull quotes, which is the house format; the only en dash is inside a verbatim quotation ("Permian–Triassic"). Frontmatter description is 56 words and states the verdict. Body word count 7,504, inside the 8,000 ceiling.
Two claims corrected against Snelling's own footnotes. The article said "Snelling's rate case rests on five citations, four of them about one animal moving itself." His rate citations are notes 5 to 15 (PDF pages 465–467 of volume-2.pdf, printed 918–920), eleven notes in all, of which only note 5 (Lohrer 2005) and note 7 (Grimm & Föllmi 1994) are community-scale; notes 9 to 15 support the sentence "Among the many such organisms, for which such burrowing rates have been measured, are annelid worms, numerous kinds of bivalves, certain razor clams, a pelecypod, several different kinds of gastropods, many crustaceans, and various crabs." The sentence is rewritten to the verified count and a new [^snelling-2009:list] footnote carries it.
One claim beyond its source, corrected. The article described the Gingras aquaria as "layered with sand and heavy minerals" and "X-ray[ed] … at 1, 6, 24, 72 and 144 hours." None of that is in the Gingras abstract, which is all of Gingras that this project has. The detail comes from Froede 2009's summary of the Gingras methods section. It is now attributed to Froede in the body with a new [^froede-2009:method] footnote, quoted verbatim from sources/web/froede-2009_sediment-bioturbation-experiments.md, and the footnote says plainly that the Gingras methods section itself was not obtained.
One unsupported inference, removed. The article said the Flood year "cannot absorb the median of the tabulated estimates, which lies in the hundreds of hours." Grimm & Föllmi's individual estimates sit in a figure matrix that the search-inside endpoint does not return as text, so no median can be computed from what was read. Replaced with the two durations the paper prints in full prose, 15.5 and 1,073 hours.
Brand & Chadwick — one misquotation and one wrong number, both fixed. The article opened the quotation one word early, printing "in a number of rock formations …"; the book reads "We have been surveying a number of rock formations …", so the "in" is now outside the quotation marks. And their scale was described as "0 to 4"; the book uses levels 1 to 4 (level 1 is "little or no bioturbation", level 4 "fully bioturbated", figure 18.13 and the caption to figure 18.10). Both corrected. The sampling-artefact concession beside the survey is kept unchanged, as instructed.
Four overclaims weakened after the skeptical reading. (1) "those rocks are Flood deposits on every young-earth model" → restricted to the models that put the boundary in the late Mesozoic or Cenozoic, which is what the body already says two sections earlier. (2) "A season is not available inside a 371-day Flood if it has to happen at thousands of stacked levels" — the thousands were never counted for the Tapeats; rewritten without the number. (3) and (4) "no such experiment has been published" and "none has appeared" → "none was found for this article," because absence of publication was not exhaustively established.
One label corrected. Chad Arment is a creation biologist, not a geologist; he publishes on baraminology and the Flood boundary from biology. "Three young-earth geologists" is now "four young-earth authors" (Froede, Arment, Akridge, Reed) in the description, the verdict paragraph and summary point 9, and the Part 5 heading now reads "creationist authors". Froede is a professional geologist and Woodmorappe is described as one in his own journal, so those two labels stand.
Literature review brought back into line with what was obtained. Lohrer 2005 and Baldwin 2004 were listed only under "Not obtained" while the article now quotes both; each now has a full entry in the body of the review, the "Not obtained" entries are rewritten to say what was recovered and what is still closed, and the "Verified" key now names three abstract-only exceptions rather than one. Also corrected: Froede, Akridge & Reed 2014 (CRSQ 51:96–103) was listed as unobtainable behind the CRSQ member wall and is in fact already in the library at sources/papers/froede-2014_phanerozoic-animal-tracks-challenge-cpt.pdf. It had no row in sources/index.tsv; one was added. It contains "bioturbation" zero times and argues the same Day-150 track point as Froede and colleagues 2022, so nothing in the article changes.
Render. http://bereanarchive.loc/unpublished-ai/bioturbation/ returns 200 with the title "Bioturbation and Trace Fossils | Berean Archive" and no PHP notices. All six internal links return 200, including the quarantine page itself.