The literature

This page exists so that nobody has to take the article on trust.  Every source it rests on is listed here with what it actually measured, who wrote it, which way it cuts, and — where it matters — what could not be obtained and what was tried.

It is deliberately not a reading list of things that agree with this site.  Sources are tagged by the direction they cut, and a reader who wants only the material that runs against the article's conclusions can filter for undercuts and read those.

How to read an entry

Measurement or model.  The most important distinction on this page.  A radiocarbon date on a dung ball is an observation.  A "peak discharge" reconstructed from high-water marks is the output of a hydraulic model, and it inherits every assumption in that model — which is exactly why every remeasurement of the Missoula floods since 2016 has made them smaller.  Both kinds of thing are useful.  They are not the same kind of thing.

Direction.  Whether the source supports, undercuts or complicates the young-earth reading of the Grand Canyon.  Assigned by what the source shows, not by what its author believes.  Several mainstream papers below are tagged supports, and several creationist papers are tagged undercuts.

Camp.  Mainstream, creationist, old-earth Christian, or unaffiliated.  This is disclosure, not a verdict.  A creationist paper reporting original field measurement is worth more than a mainstream paper restating a consensus, and the tag exists so a reader can weigh it rather than be told what to think.

Obtained.  Whether the article's author read the bytes, read only an abstract, or read the source at second hand through someone else.  Three of the sources below are quoted at second hand and every one of them is flagged.

Field definitions

Three parts of the original article have since been split off into their own pages, each with its own literature review:  the Coconino Sandstone, the Redwall nautiloid bed and how fast a canyon can be cut.  Entries below that are marked as cited in a child article are still part of the case;  they are just argued there rather than here.

The full working dossiers, with every quotation, page locator and access route recorded as it was found, are in research/ beside this page: carving.md, coconino.md, nautiloids-and-redwall.md, flood-models.md, rocks-and-dating.md, inside-the-canyon.md and rapid-incision.md.

The single most decisive sources

Six sources do most of the work in the article.  If a reader has time for six, these are the six.

He, Crow, Douglass et al. 2026 — the spillover paper

Science, 16 April 2026, pp. 289-294.  doi:10.1126/science.adz6826

topic: spillover camp: mainstream type: measurement direction: mixed obtained: full

U-Pb dates on 3,596 detrital zircon grains from nineteen sandstone samples, plus ion-microprobe dating of four interbedded ash beds.  Colorado–Green River sediment reaches the Bidahochi basin east of the Kaibab arch by 6.6 Ma, coincident with an order-of-magnitude jump in deposition rate, a strontium-isotope shift, and fish up to 75 cm long with fast-water body plans.  It reverses Dickinson 2013 and makes lake spillover the leading explanation for how the river crossed the arch.

Both halves cut.  For the creationist:  a lake overtopping a barrier is now mainstream.  Against:  "catastrophic flooding during that process is not necessarily invoked as contributing substantially to canyon deepening" (p. 294).

Karlstrom et al. 2025 — Stanton's Cave, two clocks

Geology 53(10):821-826.  doi:10.1130/G53571.1  CC-BY

topic: cave-fill camp: mainstream type: measurement direction: undercuts obtained: full

Driftwood 44 m above the river in Marble Canyon dated to 55.25 ± 2.44 ka by radiocarbon at two laboratories on two continents;  the sand enclosing it dated to 56.00 ± 6.39 ka by infrared stimulated luminescence, which measures trapped charge in feldspar and shares no calibration curve or laboratory with radiocarbon, though both assume constant decay.  Rules out a Holocene flood by name:  283,000 m³/s would be needed to float logs to the cave mouth, against 8,500 m³/s for the largest flood of the last several thousand years.

Caveat honestly recorded:  the Meteor Crater trigger in the title is a hypothesis and the authors say so.  Nothing in the article rests on it.

Mead & Agenbroad 1992 — the Rampart Cave date list

Radiocarbon 34(1):1-19.  doi:10.1017/S0033822200013370

topic: cave-fill camp: mainstream type: measurement direction: undercuts obtained: full

The primary depth-by-depth list.  Surface 10,400–11,090 BP;  46 cm 12,050;  61 cm 12,440;  67 cm 13,140;  99 cm 32,560 and 36,200;  132 cm beyond 40,000.  Laboratory prefixes A- (Arizona), I- (Isotopes Inc.) and L- (Lamont-Doherty) — three laboratories, one physical column.  One Oreamnos sample at 91 cm is out of order and the article says so.

Why it matters more than the absolute numbers.  A reader who rejects the radiocarbon calibration still cannot make deeper stop being older.

Mohr et al. 2024 — the RATE premise, measured

Geology 52(3):193-197.  doi:10.1130/G51786.1  CC-BY

topic: dating camp: mainstream type: measurement direction: undercuts obtained: full

Chemical-abrasion isotope-dilution U-Pb on zircon.  Sills intruding the Bass and Hakatai at river miles 107 and 132 give 1098.16 ± 0.59 and 1098.09 ± 0.34 Ma;  a Cardenas Basalt flow at river mile 52 gives 1082.18 ± 1.25 Ma.  Sixteen million years apart, with distinct εNd.  Both RATE Grand Canyon papers assume the sills and the Cardenas are one magmatic event.

Not written as a rebuttal.  It is ordinary geochronology that dissolved a premise, which is why it is more persuasive than a rebuttal would be.

Billingsley & Beus 1985 — the Surprise Canyon Formation

U.S. Geological Survey Bulletin 1605-A, pp. A27-A33.  Public domain.

topic: stratigraphy camp: mainstream type: measurement direction: undercuts obtained: full

Paleovalleys averaging 300 m wide and 75 m deep cut into the top of the Redwall, up to 122 m thick at Quartermaster Canyon, plus solution caves within the Redwall filled with the same sediment.  The fill holds Lepidodendron logs, 22 palynomorph species, mud cracks, burrows, stromatolites, and an estuarine transgression, with an erosional unconformity inside it and another above it.

The hardest single fact in the canyon for a one-year Flood, because it requires the surface to be out of the water, forested, for a long time, in the middle of the supposed Flood deposits.

Oard 2010, part II — the creationist case against the creationist model

Creation Research Society Quarterly 46(4):290-307.

topic: flood-model camp: creationist type: review direction: undercuts obtained: full

Titled "Fatal Problems with the Dam-Breach Hypothesis," with a section headed "My Journey Away from the Dam-Breach Hypothesis."  Two objections he calls fatal — no lake sediments, shorelines or deltas anywhere the model needs them, and the long tributary canyons graded to the trunk from 90 km away — plus a ten-item list.  His controls are exact and he anticipates the erosion rescue and kills it with a citation.

The most useful single source for showing a reader that this is a live scientific dispute inside young-earth geology, not a party line.

The carving of the canyon

Karlstrom et al. 2014 — the composite-canyon model

Nature Geoscience 7:239-244.  doi:10.1038/ngeo2065 topic: carving camp: mainstream type: measurement direction: undercuts obtained: full Apatite fission-track and helium data from paired river-level and rim samples.  Two middle segments old (70–50 Ma, 25–15 Ma), two end segments young.  What is 5–6 Ma is the integration.  The Supplementary Information, p. 10, carries the fullest accessible statement of the Muddy Creek constraint, including the 14–9 Ma Pearce Canyon alluvial fan lying across the modern river's path.

Flowers & Farley 2012 — the ancient-canyon claim

Science 338(6114):1616-1619.  doi:10.1126/science.1229390 topic: carving camp: mainstream type: measurement direction: supports obtained: full Tagged supports because it is the strongest mainstream argument that the canyon is older than the standard account allows — which cuts against the young-earth reading in absolute terms but complicates the consensus the article otherwise relies on.  Its stated limitation is decisive:  the western result rests on the helium spectra of one sample, CP06-69, because the other was too heterogeneously zoned to model.

Karlstrom et al. 2013 — the reply

Science 340(6129):143-b.  doi:10.1126/science.1233982 topic: carving camp: mainstream type: model direction: mixed obtained: full Three method objections:  the ensemble assumption across known faults, the conflict between the single-sample model and joint inversions on nearby rocks, and inherited helium from incomplete annealing.  Lucchitta's separate Comment and the Flowers and Farley response were not obtained.

Abbott 2025 — where the field stands

AGU Advances 6:e2025AV001669.  doi:10.1029/2025AV001669  CC BY-NC-ND topic: carving camp: mainstream type: review direction: mixed obtained: full The live dispute is no longer 70 Ma against 6 Ma but steady incision against a migrating knickzone.  Also carries an honest unresolved residue:  river integration "was necessary but not sufficient to produce the present iconic landscape."

Karlstrom et al. 2008 — measured incision rates

Geology 36(11):835-838.  doi:10.1130/G25032A.1 topic: incision-rate camp: mainstream type: measurement direction: undercuts obtained: full Roughly 75 m/Myr west, 250 m/Myr east, attributed to about 700 m of block uplift across the Toroweap–Hurricane system.  Also concedes an internal problem in the speleothem data:  caves of similar age at different heights, and caves of similar height with different ages.

Abbott, Lundstrom & Traub 2015 — the fastest measured rates, and the cliff-retreat number

Geosphere 11(3):638-665.  doi:10.1130/GES00978.1 topic: incision-rate camp: mainstream type: measurement direction: mixed obtained: full Tagged mixed because it cuts both ways.  1–4 km/Myr between 500 and 400 ka is the mainstream's own demonstration that incision comes in pulses, which legitimises the shape of a catastrophist argument.  And 600–800 m/Myr of Redwall–Muav scarp retreat, converging with two other measurements over 13 ka and 19 Ma — independent in technique, all three assuming constant decay — is the hardest number against a young canyon, because it is what makes the canyon wide.  A Comment by Crow et al. and a Reply were not obtained.

Cole & Mayer 1982, and the three 1983 Comments — the cliff-retreat number

Geology 10(11):597-599, with Comments and Replies at Geology 11:314-316 and 494-495. topic: incision-rate camp: mainstream type: measurement direction: undercuts obtained: full The load-bearing number for the width argument, and the only one of the three retreat rates that needs no assumption a young-earth reader rejects:  the Redwall Limestone cliff retreating at 0.45 m per 1,000 radiocarbon years, a regression slope on 14 dated Pleistocene packrat middens with a 95 per cent confidence interval of 0.18 to 0.72.  Full text and all three Comments obtained and read 2026-09-04, correcting an earlier record of "abstract only";  route was the archive.org microfilm issues sim_geology_1982-11_10_11 and sim_geology_1983-05_11_5 / sim_geology_1983-08_11_8, print-disabled and unborrowable but readable paragraph by paragraph with bin/iapdsearch.py (leaf 40 = p. 597).  Haman's Comment is the strongest and it helps the creationist:  all 14 sites sit on cliff salients, where retreat is four to five times slower than at embayments, so the published rate is a floor.  Granting that factor of five and a tenfold radiocarbon compression on top of it still leaves each canyon wall short by a factor of about 30 at the narrowest point.  The full per-wall arithmetic is in the child article rapid-canyon-cutting.

Dorsey & Lazear 2013 — the sediment budget

Geosphere 9(4):781-791.  doi:10.1130/GES00784.1 topic: sediment-budget camp: mainstream type: model direction: mixed obtained: full 3.4 ± 1.2 × 10⁵ km³ eroded from the plateau against 2.8 ± 0.6 × 10⁵ km³ in the Salton Trough — but only on the generous crustal reading.  "There is no overlap" on the conservative one (p. 786).  The implied sediment flux matching the pre-dam gauged rate at Yuma is the better cross-check, with the authors' own caveat that their reading of the gauge data is higher than the usual figure.

Dickinson 2013 — the mainstream case against spillover

Geosphere 9(1):1-20.  doi:10.1130/GES00839.1 topic: spillover camp: mainstream type: model direction: supports obtained: full Tagged supports because it is the strongest published objection to the mechanism the creationist model needs, and a young-earth reader should meet it.  Largely reversed by He et al. 2026, but its trilemma at p. 6 is still the right set of questions to ask any spillover model, creationist or not.

Meek & Douglass 2001 — the mainstream original

Colorado River: Origin and Evolution, Grand Canyon Association, pp. 199-205. topic: spillover camp: mainstream type: model direction: supports obtained: full The paper creationists can most fairly cite.  Note what it actually proposes:  episodic spillover through a chain of basins "between ~10 and 4 Ma", not one event.  Their Mojave disappearing-evidence argument is a real one creationists may borrow, and it is also, precisely, unfalsifiable.

Fenton, Webb & Cerling 2006 — the control experiment

Quaternary Research 65:324-335. topic: rapid-incision camp: mainstream type: measurement direction: undercuts obtained: full A 366 m lava dam failed at 165 ka releasing 11 km³ in 31 hours at 2.3–5.3 × 10⁵ m³/s — top ten in North America.  It left boulder deposits along 32 km.  And the reach it traversed has a lower long-term incision rate than the reach it did not, which the authors attribute to "the ineffective erosive power of lava-dam outburst floods."

Heaton 1995 — a respectful critic

Skeptical Inquirer 19(3):33-36. topic: flood-model camp: unaffiliated type: review direction: undercuts obtained: full Read from the author's own web posting, so no quotation can be pinned to a printed page.  A professional geologist who corresponded with Austin before writing, calls his research "rigorous", concedes his critique of uniformitarianism, and then gives the equilibrium-drainage test that is the best-designed empirical argument in the critique literature.

Hill & Moshier 2009 — the old-earth Christian statement

Perspectives on Science and Christian Faith 61(2):99-115. topic: flood-model camp: old-earth-christian type: review direction: mixed obtained: full Its scope is narrower than its reputation:  it answers Tom Vail's coffee-table book, not Austin's technical work, and never engages the lake volumes.  It concedes the nautiloid bed, and it concedes a mass-balance problem in its own camp — "actual measured incision rates are too low (not too high)."  Its uncited "29–31°" for Coconino cross-beds is simply wrong, and the article says so.

The young-earth models

Austin 1994 — Grand Canyon: Monument to Catastrophe, chapter 5

Institute for Creation Research. topic: flood-model camp: creationist type: book direction: supports obtained: full Read through the archive.org search-inside route on a print-disabled item that cannot be borrowed;  leaf-to-page offset 10, anchored twice against the book's own index.  Contains the lake area and volume, the piping mechanism, the four self-stated predictions, and the Missoula comparison figures the article uses for its water-to-rock test.  Contains no duration and no discharge for the breach — searched exhaustively.

Austin, Holroyd & McQueen 2020 — the current defence

Answers Research Journal 13:153-188. topic: spillover camp: creationist type: review direction: supports obtained: full Renames the model "spillover", lists mainstream co-developers, and drops the Utah lake.  Also carries the priority dispute with Walt Brown in endnotes 35-42.  Searched for weeks, days, discharge and cubic:  zero hits for each.

Brown 2019 — In the Beginning, 9th edition

Center for Scientific Creation, pp. 215-257. topic: flood-model camp: creationist type: book direction: supports obtained: full The source of "carved the Grand Canyon in weeks" and of the only discharge figure in the creationist literature.  Austin's own objection to it is quoted in the article:  Brown has Grand Lake at 5,700 ft draining into Hopi Lake at 5,950 ft.

Oard 2010–2011, parts I–V, and 2021

Creation Research Society Quarterly 46:185-200, 290-307;  47:45-57, 146-157, 271-282;  57:206-222. topic: flood-model camp: creationist type: review direction: mixed obtained: full All free from the society's own repository, which is a better route than creation.com for his technical work.  Part III is the water-gap argument, and its core point — that no mainstream mechanism predicts which ridges get gapped — is conceded in the article.  Part V is his positive model, and it is qualitative:  no discharge, no duration, no sediment budget, and no account of where the eroded rock went, which is the objection he presses against Austin.

Oard 2013 — the CMI critique of Brown

Creation Ministries International. topic: flood-model camp: creationist type: review direction: undercuts obtained: full Carries the water-to-rock arithmetic the article uses.  Verdict:  "his hypothesis won't work."

Clarey 2018 — ICR against ICR's founding model

Acts & Facts, Institute for Creation Research, 30 November 2018. topic: flood-model camp: creationist type: popular direction: undercuts obtained: full "Merely drawing in a vast lake based on today's topography, without strong evidence to back it, is speculation, not science."  He also cites the old-earth Kregel rebuttal volume against Austin, and diagnoses the cause as Austin's choice of Flood boundary.

Snelling & Vail 2014 — the AiG hybrid

The New Answers Book 3, chapter 18, pp. 175-191. topic: flood-model camp: creationist type: popular direction: mixed obtained: full Teaches sheet erosion, then channelling, then dam breach, and admits the internal split in print.  Its Great Denudation figure of "around 100,000 cubic miles" is fifty times Brown's figure for the same event;  neither source addresses the discrepancy.  No printed-page locator was obtainable because the PDF of the book chapter no longer serves.

Morris 2011 — the Scablands analogy

Acts & Facts 40(10):15. topic: rapid-incision camp: creationist type: popular direction: supports obtained: full Short, accurate about Bretz, and ends with a fair question the article answers rather than dismisses.

Austin, "Rapid Erosion at Mount St. Helens" — ICR research page

topic: rapid-incision camp: creationist type: measurement direction: supports obtained: full Quote this rather than the popularisations.  Austin says plainly that the 1982 mudflow cut 1980 pumice and rockslide debris, not bedrock — and the genuinely valuable observation, that a dendritic network and amphitheatre heads formed in a day, survives the material objection.  Compare Snelling's 2010 AiG restatement, which gives the date as 19 May rather than 19 March and claims "Bedrock was eroded up to 600 feet deep."  That comparison is now cited in the child article rapid-canyon-cutting;  the parent keeps only Austin's own page.

Brown 1992 — the radiocarbon rescue, applied to Rampart Cave

Creation Research Society Quarterly 29(1):45-47. topic: cave-fill camp: creationist type: model direction: supports obtained: full The only creationist engagement with the canyon's cave fill that could be found.  Flood at 5,350 BP, initial ¹⁴C at 1.1% of modern.  His complaint that 1.9 dung pellets a year is a silly rate is legitimate.  His own table then puts the bottom of the dung two years after the Flood, inside a canyon his own side says was cut after the Flood.

Rapid bedrock incision

Lamb & Fonstad 2010 — Canyon Lake Gorge

Nature Geoscience 3:477-481.  doi:10.1038/ngeo894 topic: rapid-incision camp: mainstream type: measurement direction: supports obtained: full The strongest source in the catastrophist's favour anywhere, and it is mainstream.  About 7 m of jointed limestone removed in three days at 1,461 m³/s, by plucking of 0.7 m bedding slabs;  the exposed bedding planes carry unworn Cretaceous ripple marks.  And their own warning:  "A narrow gorge is sometimes inferred to represent slow persistent erosion, whereas Canyon Lake Gorge was formed in a matter of days."  Its own first sentence names the Grand Canyon as the slow-cut end member.

Antón et al. 2015 — Ricobayo, in granite

Nature Communications 6:7963.  doi:10.1038/ncomms8963 topic: rapid-incision camp: mainstream type: measurement direction: supports obtained: full About 100 m of incision and 160 m of widening in unweathered granite in six years, at only 80–1,500 m³/s.  Defeats both the "only weak rock" and the "only megafloods" objections.  It does not defeat the joint-control requirement — their own conclusion is that faults and joints, not discharge, set the erosion.

Lamb, Mackey & Farley 2014 — Malad Gorge

PNAS 111(1):57-62.  doi:10.1073/pnas.1312251111 topic: rapid-incision camp: mainstream type: measurement direction: mixed obtained: full The cleanest natural experiment available.  Same basalt, two morphologies:  flood-cut amphitheatre heads at about 46 ka, and a knickzone retreating at 2.5 cm/yr for 33 ka.  Rapid incision is a threshold property, not a rock property — and the ordinary river is below the threshold essentially all the time.

Whipple, Hancock & Anderson 2000 — the physics

GSA Bulletin 112(3):490-503. topic: rapid-incision camp: mainstream type: model direction: mixed obtained: full Joint spacing sets the process.  Plucking dominates below about a metre;  above 3–5 m, abrasion takes over and everything slows by orders of magnitude.  Read from a copy that paginates 1-10 rather than 490-503, so quotations are located by section.  On cavitation, which Austin and Holroyd propose:  possible above 10 m depth, but "Direct field evidence of cavitation erosion is, however, lacking."

Bretz 1923 — the founding description

The Journal of Geology 31(8):617-649.  Public domain. topic: rapid-incision camp: mainstream type: measurement direction: mixed obtained: full The source of the morphology test the article uses.  Flood tracts are "anastomosing or 'braided'";  the ground the flood missed keeps "the dendritic drainage pattern."  Two numerals in the scan's text layer were corrupt and had to be recovered by re-running character recognition on the page images.

O'Connor & Baker 1992 — Missoula peak discharge

GSA Bulletin 104(3):267-279. topic: rapid-incision camp: mainstream type: model direction: supports obtained: full More than 17 ± 3 million m³/s in the Spokane Valley;  flow duration on the order of several days;  lake volume 2,184 km³.  A model output from high-water marks, not a gauged measurement, which is why it has since been revised downward.

O'Connor et al. 2020 — the review, and the flood count

Earth-Science Reviews 208:103181. topic: rapid-incision camp: mainstream type: review direction: undercuts obtained: full "at least 104, possibly 109 floods" over three to four thousand years.  Read as the green open-access author manuscript, so its internal pagination is not the journal's and quotations are located by section.

Larsen & Lamb 2016, David et al. 2022, Lehnigk et al. 2024, van der Bilt et al. 2021 — the downsizing

Nature 538:229-232;  GRL 49:e2022GL097861;  GSA Bulletin 136:4398-4410;  Communications Earth & Environment 2:66. topic: rapid-incision camp: mainstream type: measurement direction: undercuts obtained: full Four independent remeasurements, four downward revisions:  five- to tenfold at Moses Coulee, 30–40 per cent at the Columbia Gorge, about 4.5-fold at upper Grand Coulee, and "at most a third" in Iceland.  Lehnigk also supplies the volumes — 67.8 km³ from upper Grand Coulee in 6 ± 1 floods — and the cataract retreat rates of a kilometre or more per day that are the catastrophist's best measured number.

The Coconino Sandstone

McKee 1979 — the primary eolian case

A Study of Global Sand Seas, USGS Professional Paper 1052, Coconino section pp. 197-203.  Public domain. topic: coconino camp: mainstream type: measurement direction: undercuts obtained: full Printed page = PDF page − 9, anchored twice.  Carries the 1945 five-criterion ripple analysis, the rain-print morphology, the dry-sand slump marks, and the chuckwalla and millipede experiments.  Far more careful than its reputation:  he disclaims texture as proof of wind, and concedes that the contorted bedding is ambiguous.  The ripple measurements are the most under-answered evidence in the whole dispute.

Whitmore 2019 — the eleven points

Answers Research Journal 12:275-328. topic: coconino camp: creationist type: review direction: supports obtained: full The canonical statement of the subaqueous case.  Item 7 (dips near 20°) is right and well measured.  Item 6 (no avalanche tongues) fails on the movement's own sources.  Item 10 (no grainfall or grainflow) misstates the paper it cites.  The same paper defends the reality of the geological column against other creationists.

Whitmore & Garner 2018 — the fullest version

Proceedings of the Eighth International Conference on Creationism, pp. 581-627. topic: coconino camp: creationist type: review direction: supports obtained: full About 500 references.  Contains the compaction rebuttal, which is good petrography;  the treatment of rain prints and ripples, which independently confirms McKee's fourth criterion and passes over its significance;  the fairest available statement of Brand's four anomalies;  and the admission that "There are no modern analogs that match the precise sedimentology of the Coconino."

Whitmore, Strom, Cheung & Garner 2014 — the petrology

Answers Research Journal 7:499-532. topic: coconino camp: creationist type: measurement direction: mixed obtained: full Tagged mixed because it does both.  The mica and K-feldspar results are the creationists' best unanswered argument.  The grain-frosting result retires an argument the eolian side had been using.  The published PDF's font map is scrambled and text extracted from it is nonsense;  use the publisher's HTML.

Whitmore & Strom 2010 — the injectites

Sedimentary Geology 230(1-2):46-59.  doi:10.1016/j.sedgeo.2010.06.022 topic: coconino camp: creationist type: measurement direction: mixed obtained: full Creationist original fieldwork in a mainstream Elsevier journal, at thirty sites under a Park Service permit, and a genuine correction to McKee.  It is a null result as a Flood argument because its authors date the injection to Laramide faulting, some 200 Myr after deposition.  The widely circulated DOI ending .019 is wrong.

Maithel, Brand & Whitmore 2021 — the cross-bed characterisation

Sedimentology 68(1):238-265.  doi:10.1111/sed.12774 topic: coconino camp: creationist type: measurement direction: undercuts obtained: abstract-only The peer-reviewed version of Maithel's dissertation, with Brand and Whitmore as co-authors.  Its finding — the cross-beds "may consist of grainflow and grainfall deposits, but these remain difficult to differentiate" — is the strongest single point against the creationist synthesis, and it comes from inside the creationist team.  Closed access;  only the publisher-deposited abstract was read, and the body was not.

Brand & Tang 1991, and the 1992 Comments

Geology 19:1201-1204;  Geology 20:666-670. topic: trackways camp: creationist type: measurement direction: supports obtained: not-obtained Neither obtained — GeoScienceWorld is Cloudflare-blocked to this project.  The article therefore states Brand's anomalies through Whitmore and Garner's summary, which is a hostile witness and so a fair route, and does not quote Loope's translatent-strata argument at all.  The correct title is "Fossil vertebrate footprints … Evidence for underwater origin"; the commonly cited variant is wrong.  Now handled in the child article coconino-sandstone, not in the parent.

Brand 1996 — the experiment that removes the diagnostic

Journal of Paleontology 70(6):1004-1010. topic: trackways camp: creationist type: measurement direction: undercuts obtained: abstract-only 230 newt trackways, ten substrate combinations.  Distorted toe marks appear "underwater or on sloped, damp sand."  The abstract text was reconstructed from the publisher-deposited record, not read off the printed page, and should be re-verified before republication.  It is the load-bearing quotation in the trackway section and that caveat matters.

Marchetti et al. 2020 — the ichnological verdict

NPS Grand Canyon Centennial Paleontological Resource Inventory, chapter 9, pp. 333-379.  Public domain. topic: trackways camp: mainstream type: review direction: undercuts obtained: full The best available source for the trackway dispute, and free.  Rejects Brand and Tang at p. 361, supplies the gravity-driven digit-sliding mechanism, invalidates Chelichnus and Laoporus, and reports the prediction that came true:  subtract the slope effects and the Coconino fauna is the ordinary contemporary fauna.  The primary paper behind it, Marchetti et al. 2019 in Earth-Science Reviews, was not obtained.

Brand & Chadwick 2018 — Faith, Reason, & Earth History, 3rd ed.

Andrews University Press. topic: trackways camp: creationist type: book direction: undercuts obtained: full Page 474 is the most candid statement in the whole dispute:  the sedimentology points to wind, he cannot reconcile it, and his result "does not show whether the tracks were or were not made in the biblical flood."

Helble 2011 — the sediment budget

Perspectives on Science and Christian Faith 63(1):25-41. topic: coconino camp: old-earth-christian type: model direction: undercuts obtained: full 26 km³ against 42,000 km³ required, computed at ten times Austin's own transport rate with nine further assumptions granted to the creationist side.  One weak swipe at Brand on p. 29 that the article does not use.

Whitmore & Garner 2025 — the reply that concedes

Proceedings of the 2025 New Scholars ICC, p. 32. topic: coconino camp: creationist type: abstract direction: undercuts obtained: full A one-page abstract in a volume its own author edited.  "Helble is correct that the processes he outlines could not have formed the Coconino during the Flood."

Middleton, Elliott & Morales 2003 — the standard modern statement

Grand Canyon Geology, 2nd ed., Oxford University Press, pp. 163-179. topic: coconino camp: mainstream type: review direction: undercuts obtained: not-obtained This is the real gap.  Whitmore and Garner call it "the most often cited technical summary of the Coconino," and everything known about it here is quoted through them.  No scan of either edition exists on archive.org, so the print-disabled paragraph route does not apply.  It would settle the wind-ripple-lamination question, which is the last live diagnostic.  Untried:  interlibrary loan.  Now discussed in the child article coconino-sandstone, not in the parent.

The nautiloid bed

Austin 2003 — the primary paper

Proceedings of the Fifth International Conference on Creationism, pp. 55-99. topic: nautiloids camp: creationist type: measurement direction: supports obtained: full Sixty-plus localities, more than a thousand fossils observed, 403 measured, 337 orientations.  Contains no reference to Noah, Genesis or a global flood — searched.  Its positive evidence for rapid emplacement is coherent;  its density extrapolation is its weakest joint;  and it runs none of the standard taphonomic tests that would distinguish an event bed from a condensed lag.  Note the access route:  digitalcommons.cedarville.edu is dead and serves a stub for every path;  the live repository is cedarville.tind.io.

Kröger et al. 2011 — the same object, the opposite verdict

Fossil Record 14(1):35-53.  doi:10.1002/mmng.201000014  CC-BY topic: nautiloids camp: mainstream type: measurement direction: undercuts obtained: full A decimetre-thick bed densely packed with bipolarly oriented orthocones over 120 cm long, read as time-averaged rather than as an event bed, on reworking, bioerosion, fragmentation, telescoping, epizoans and size-class sorting.  The article's fairest single comparison, because it shows the tests exist, that the field is not hostile to catastrophic readings on principle, and that nobody has applied them to the Redwall bed.  Now cited in the child article redwall-nautiloid-bed, not in the parent.

Lindskog & Eriksson 2017 — the slow analogue

GFF 139(3):163-183. topic: nautiloids camp: mainstream type: measurement direction: undercuts obtained: full Dense, preferentially aligned cephalopod accumulations forming at "a few millimeters per millennium."  Read as the accepted manuscript, whose pagination is not the journal's.  Now cited in the child article redwall-nautiloid-bed, not in the parent.

Yacobucci 2018 — postmortem drift

PeerJ 6:e5909.  doi:10.7717/peerj.5909  CC-BY topic: nautiloids camp: mainstream type: compilation direction: supports obtained: full Low-inflation shells like orthocones rarely float, and modern nautilids drift little.  Supports Austin's population-in-place reading, though it does not distinguish one burial from many.  Now cited in the child article redwall-nautiloid-bed, not in the parent.

McKee & Gutschick 1969 — History of the Redwall Limestone

GSA Memoir 114. topic: nautiloids camp: mainstream type: book direction: background obtained: not-obtained Not obtained.  Not on archive.org;  HathiTrust refuses this project's client.  Everything from it reaches the article at second hand through Austin's own quotation of it, which is a fair route because he is quoting it against himself:  on his telling the monograph is silent on the nautiloids rather than opposed to him.  No page number from this monograph appears in the article.  Now discussed in the child article redwall-nautiloid-bed, not in the parent.

The rock record

Billingsley 2000 — the geologic map pamphlet

USGS Geologic Investigations Series I-2688.  Public domain. topic: stratigraphy camp: mainstream type: measurement direction: background obtained: full The authority for lithology and thickness, with an east-to-west range for every unit.  Also records erosional relief throughout the Paleozoic section — Temple Butte channels to 30 m, Hermit basal channels to 40 m in Havasu Canyon, 24 m at the Manakacha–Wescogame contact.  One printed error to quote with care:  its Hermit desiccation cracks "as much as 2 ft (0.05 m) wide" — 0.05 m is two inches.

Karlstrom et al. 2021 — Telling Time at Grand Canyon

NPS/GRCA/NRR—2021/2246, with the numeric-ages table updated March 2024. topic: dating camp: mainstream type: compilation direction: mixed obtained: full The source for the age column, and for the fact that most Paleozoic ages are biostratigraphic.  Also carries the sentence a creationist should be given:  "more time is missing … than preserved."  The Geologic Resources Inventory for the park misprints Polyak's western-canyon rate as 3.2–7.2 m/Myr against the published 55–123;  do not cite the GRI for that number.

Karlstrom et al. 2020 — the Tonto Group recalibrated

Geology 48(5):425-430.  doi:10.1130/G46755.1 topic: dating camp: mainstream type: measurement direction: undercuts obtained: full Tandem laser-ablation screening then isotope-dilution mass spectrometry, giving the Tapeats a maximum depositional age of ≤508.19 ± 0.39 Ma.  Also the diachroneity:  the Glossopleura zone sits "high in the Bright Angel Formation to the west and lower in the east."  And the deposition rate of 50 m/Myr forced by the data.

Dehler et al. 2024 — the modern Cambrian synthesis

GSA Today 34(11):4-11.  doi:10.1130/GSATG604A.1  Gold open access. topic: stratigraphy camp: mainstream type: review direction: undercuts obtained: full Five sequences, three internal disconformities identified from missing biozones, and the explicit statement that unconformities are expected on a flat, stable, pre-vegetated margin.  Also states an honest limit:  the Tonto Group is poorly fossiliferous and zone boundaries cannot be pinned in most sections.

Thurston et al. 2022, and the 2022 Comment and Reply

Geology 50(2):222-226;  Geology 50(3):e543 and e544. topic: unconformity camp: mainstream type: measurement direction: mixed obtained: full The 200-to-1,300-million-year variation along one canyon, and the sharpest published exchange in the field.  Peak et al. 2021, the paper the exchange is about, was not obtained — its argument is recoverable from the Comment and Reply, both of which were.

Keller et al. 2019 and Flowers et al. 2020 — the origin dispute

PNAS 116(4):1136-1145;  PNAS 117(19):10172-10180. topic: unconformity camp: mainstream type: model direction: mixed obtained: full Snowball Earth glacial erosion against diachronous regional tectonics.  Both obtained as text only;  neither PDF was retrieved.  The disagreement is over which hundred-million-year window, which is the point the article makes with them.

White 1929 — Flora of the Hermit Shale

Carnegie Institution of Washington Publication 405.  Public domain. topic: stratigraphy camp: mainstream type: measurement direction: undercuts obtained: full The sun-cracks at pp. 8-9, at the exact contact used to argue that no time passed:  over 15 inches wide, 25 feet deep, with infallen shale proving they stood open, and an earthquake origin explicitly rejected on the geometry.  A hundred-year-old observation that nobody on either side seems to have used.

McKee 1969 — Stratified Rocks of the Grand Canyon

USGS Professional Paper 669.  Public domain. topic: stratigraphy camp: mainstream type: measurement direction: mixed obtained: full Page offset 12, anchored three times.  Carries the Temple Butte channels and Noble's 28-mile mapping, and also the strongest statement of the flat-gap problem — in the mainstream's own words.

Winograd & Thordarson 1975 — the missing systems, 250 km west

USGS Professional Paper 712-C, Table 1, p. C11.  Public domain. topic: stratigraphy camp: mainstream type: measurement direction: undercuts obtained: full Roughly 3,400 ft of Ordovician and 1,415 ft of Silurian–Devonian at the Nevada Test Site, in the interval that is a knife-edge gap in the canyon.  The positive evidence the flat-gap answer needs, and it is a measurement rather than an inference.

Austin & Snelling 1998, and Snelling, Austin & Hoesch 2003 — the RATE papers

ICC IV, pp. 35-52;  ICC V, pp. 269-284. topic: dating camp: creationist type: measurement direction: supports obtained: full The discordances are real measurements and the article says so.  What has failed is the premise that the sills and the Cardenas are one event — and two of their five Bass Rapids isochrons contain the modern zircon age inside their own stated errors.  No published technical rebuttal aimed specifically at the Bass Rapids paper was found, and the article attributes none to anybody.

Isaac 2007 — the general answer

Perspectives on Science and Christian Faith 59(2):143-146. topic: dating camp: old-earth-christian type: review direction: undercuts obtained: full "no argument is presented why differences of 15% would justify the claim that radioisotope dating is in error by a factor of one million or more."

Roth 2012 and Snelling 1992 — the flat-gap argument

Geoscience Research Institute;  Creation 14(3):30-35. topic: stratigraphy camp: creationist type: review direction: supports obtained: full Stated at full strength in the article before being answered.  Roth's technical version, Journal of Creation 23(2):76-81 (2009), was not obtained, so the article engages only the short public statement and says so.

Mitchell & Tillman 2024 — the rate arithmetic

Peaceful Science, part 2 of Examining Young Earth Creation Claims About the Grand Canyon. topic: stratigraphy camp: old-earth-christian type: model direction: undercuts obtained: full 0.5 to 1.4 metres per hour, computed from Snelling's own model.  Their footnote markers interleave badly when the page is stripped of tags, and one attribution could not be pinned;  only the arithmetic is used.

Considered and not used

• Desert varnish as a dating method. No Grand Canyon calibration was found. Dropped.
• Stanton's Cave as a direct incision-rate constraint. That was the older reading; the 2025 work shows it is a lake deposit, and the article says so rather than using a superseded argument that would favour its own case.
• Canyon volume divided by the modern sediment load. It credits the canyon with sediment delivered from Utah and Colorado, and the volume figure has no primary source.
• Hill 2006, "Qualitative Hydrology of Noah's Flood," PSCF 58(2):121-129. Read; it argues for a local Mesopotamian flood and does not bear on canyon carving.
• Oard 2020, "Rapid growth of caves and speleothems," Journal of Creation 34. Already in the project library. It is about stalagmite growth rate, not about uranium-lead on mammillaries or uranium-series on travertine, and is not about the Grand Canyon.
• Gupta et al. 2007 and 2017 (English Channel), García-Castellanos et al. 2009 (Zanclean flood). Scale illustrations only; not fetched, not cited. A live trap recorded: nature.com/articles/ncomms15694.pdf served a completely unrelated paper when fetched on 30 August 2026.
• Oroville spillway 2017. Checked; it adds nothing that Canyon Lake Gorge and Ricobayo do not say better with published measurements.
• Sklar & Dietrich 2004 and Chatanantavet & Parker 2009, the abrasion models. The American Geophysical Union's delivery endpoint refuses this project's client. Their content reaches the article only through Whipple et al. 2000 and Lamb et al. 2008, and neither is quoted.

What could not be obtained, and what was tried

Every item was attempted.  Nothing here should be recorded as unobtainable without trying the noted route.

A standing note on method

Not one quotation, page number, date or numeral in the article or on this page was established through an AI summarising tool.  Every source marked obtained: full was downloaded as bytes and read locally.  Where only an abstract was available, the entry says abstract-only and the article says so at the point of use.  Where a source reaches the article through somebody else's quotation of it, the entry says second-hand and the article names the intermediary.

Three access routes found during this work are worth keeping and have been written into the project's source-access notes:  par.nsf.gov/servlets/purl/<id> returns the full text of any recent National-Science-Foundation-funded paper with no login, which supplied six papers that three institutional repositories and a publisher's bot wall had all refused;  npshistory.com mirrors National Park Service technical reports that the agency's own repository serves only through JavaScript;  and a print-disabled archive.org book that cannot be borrowed can still be read paragraph by paragraph, which is how chapter five of Grand Canyon: Monument to Catastrophe reached this article.