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, and which way it cuts.

A catalogue of the literature on the nautiloid-rich bed near the base of the Redwall Limestone: what Austin measured, what the ministry versions say he measured, who has answered him, and what the mainstream literature on dense orthocone beds shows.

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 undercuts the argument made in the main article can filter for undercuts and read those.

Direction is assigned by what the source shows, not by what its author believes.  Austin's own paper is tagged supports because its data support a rapid emplacement, and two Answers in Genesis pages are tagged undercuts because checking them against their own citation damages the case they are making.

Field definitions

The primary claim

Nautiloid mass kill and burial event, Redwall Limestone (Lower Mississippian), Grand Canyon region, Arizona and Nevada

Austin, Steven A.  Proceedings of the Fifth International Conference on Creationism, pp. 55–99.  Pittsburgh: Creation Science Fellowship (2003).

https://cedarville.tind.io/record/20987

camp: creationist topic: wnb-primary method: field survey direction: supports verified: full

Key figures: platform facies 2.0 ± 0.1 m thick over > 1.5 × 10⁴ km²;  slope facies 3–14 m over another 1.5 × 10⁴ km², nautiloids rare;  bed area "exceeds 3 x 10^4 km^2," volume "exceeds 100 km^3";  more than 1,000 fossils observed, 403 shells measured (mean maximum diameter 9.6 cm, s.d. 4.3), 337 orientations;  85% plunge under 10°, about 15% near-vertical and 100% of those apex-down;  flow model at 30 m water depth, 8 m flow thickness, 35% solids, ≥ 5 m/s, 200 km restored traverse in "several hours";  kinetic energy about 4 × 10¹⁵ J.

The only technical treatment of this bed that exists.  It names the unit, maps three facies across Arizona, Utah and Nevada, and argues for emplacement by a hyperconcentrated sediment gravity flow.  The rapid-emplacement evidence is inverse grading, outsized coral heads suspended in mid-bed, fluid-escape pipes and the apex-down verticals.  The paper contains no reference to Noah, Genesis or a global flood, and situates the bed among mainstream event beds Austin accepts as real.  Its two soft joints are the density extrapolation to 15,000 km² and the complete absence of the standard taphonomic discriminators.

Sedimentary Model for Canyon-Length Mass Kill of Large Orthocone Nautiloids: A Proposal for Research

Austin, Steven A.  Santee, California: Institute for Creation Research (2001).

camp: creationist topic: wnb-primary method: commentary direction: — verified: none

Not obtained.  This is the document Gary Parker cites for "perhaps four billion nautiloids."  icr.org/search?q= and icr.org/articles/search/?q= both return 404, and it was not found elsewhere.  Until it is read, the origin of the four-billion figure is unknown.  Would be worth one attempt through the Wayback Machine.

Were Grand Canyon Limestones Deposited by Calm and Placid Seas?

Austin, Steven A.  Institute for Creation Research.

https://www.icr.org/content/were-grand-canyon-limestones-deposited-calm-and-placid-seas

camp: creationist topic: popular-retelling method: commentary direction: mixed verified: full

Considered and not cited.  This is the older popular piece;  its nautiloid material is footnoted to "Observation of Steven A. Austin in Nautiloid Canyon, April 1989," which predates the survey.  It also quotes McKee and Gutschick against slow deposition, and those two quotations could not be verified because the monograph is unobtainable.  They are in quarantine.md.

The ministry retellings

What Are Some of the Best Flood Evidences?

Snelling, Andrew A.  Answers in Genesis.

https://answersingenesis.org/the-flood/what-are-some-of-the-best-flood-evidences/

camp: creationist topic: popular-retelling method: commentary direction: undercuts verified: full

Key figures: "billions" of nautiloids;  "7 feet (2 m) thick layer";  "180 miles (290 km)";  "at least 10,500 square miles (30,000 km2)";  "24 cubic miles (100 km3)";  "more than 16 feet (5 m) per second."

Cites Austin's 2003 paper correctly, with the right page range and editor, and then attaches to the nautiloids three figures that in the paper belong to the whole bed.  The 30,000 km² and the 100 km³ are platform plus slope facies, and Austin says twice that nautiloids are rare or absent in the slope facies.  The 290 km is the un-restored present-day map distance;  Austin's flow model uses the restored 200 km.  Every hedge in Austin's own sentence is dropped.  Retrieved with curl and tag-stripped locally.

Fossil Evidence in the Grand Canyon

Parker, Gary.  Answers in Genesis.

https://answersingenesis.org/geology/grand-canyon-facts/fossil-evidence-grand-canyon/

camp: creationist topic: popular-retelling method: commentary direction: undercuts verified: full

Gives "perhaps four billion nautiloids," a figure absent from the 2003 paper, whose own arithmetic yields about fifteen billion.  Its citation is the 2001 research proposal rather than the data paper.  Retrieved with curl and tag-stripped locally.

The published critique

Flood Geology and the Grand Canyon: A Critique

Hill, Carol A. and Stephen O. Moshier.  Perspectives on Science and Christian Faith 61(2):99–115 (June 2009).

https://www.asa3.org/ASA/PSCF/2009/PSCF6-09Hill.pdf

camp: old-earth-christian topic: critique method: review direction: mixed verified: full

The only published critique of the nautiloid claim, and it runs two paragraphs, pp. 109–110.  It concedes the bed as possibly "some kind of debris-flow-type deposit" and objects only to the inference from one bed to a global flood.  Its sources for the section are an Institute for Creation Research video, Tom Vail's Grand Canyon: A Different View and Breed's 1969 discovery note;  Austin's technical paper is not among them.  Its one empirical objection, that the shells show no breakage or abrasion, is contradicted by Austin's own report of ruptured body chambers and broken segments.  On disk at sources/papers/hill-2009_flood-geology-and-the-grand-canyon-critique.pdf.

The Grand Canyon: Monument to an Ancient Earth

Hill, Carol, Gregg Davidson, Tim Helble and Wayne Ranney (eds.).  Grand Rapids: Kregel (2016).

camp: old-earth-christian topic: critique method: review direction: — verified: none

Not obtained and judged not load-bearing.  Archive.org title searches return nothing.  A hoopla or Libby borrow would spend one of ten monthly borrows, and Hill & Moshier 2009 is already on disk and makes the same concession, so the borrow was not made.

Any re-examination of the outcrop

camp: mainstream topic: critique direction: — verified: none

None exists.  An OpenAlex search for the exact string "Whitmore Nautiloid Bed" returns three works, all International Conference on Creationism papers: Austin 2003, Stansbury 2003 on the Anchor Limestone dune, and Stansbury 2013 on debris-flow termination in the lower Redwall.  A search for Rayonnoceras with the Redwall Limestone returns two, Austin 2003 and Miller & Youngquist 1949.  No mainstream field study, petrographic study or rebuttal was found.  The article therefore states that the claim has been ignored, not refuted.

Dense orthocone beds in the mainstream literature

Mass concentration of Hirnantian cephalopods from the Siljan District, Sweden

Kröger, Björn, Jan Ove R. Ebbestad, Anette E. S. Högström and Åsa M. Frisk.  Fossil Record 14(1):35–53 (2011).  doi:10.1002/mmng.201000014  CC-BY.

https://fr.copernicus.org/articles/14/35/2011/fr-14-35-2011.pdf

camp: mainstream topic: orthocone-analogue method: measurement direction: undercuts verified: full

The most useful source in this file.  A decimetre-thick bed densely packed with bipolarly oriented orthocones over 120 cm long, read as time-averaged rather than an event bed on seven taphonomic criteria: reworking, bioerosion, fragmentation, telescoping, apex preservation, epizoans and size-class sorting.  Austin runs none of them.  It also creates a direct methodological clash: these authors read a wide conch-size spectrum as evidence against a single-population origin, the opposite of Austin's inference from a lognormal size histogram, which is why the article treats the histogram as non-diagnostic.  Locator anchored by running heads, PDF offset 34.  Saved as sources/papers/kroger-2011_hirnantian-cephalopod-mass-concentration-siljan.pdf.

Megascopic processes reflected in the microscopic realm: the Middle Ordovician "orthoceratite limestone" at Kinnekulle, Sweden

Lindskog, Anders and Mats E. Eriksson.  GFF 139(3):163–183 (2017).  doi:10.1080/11035897.2017.1291538

https://lup.lub.lu.se/search/files/75719165/Lindskog_Eriksson_2017_GFF.pdf

camp: mainstream topic: orthocone-analogue method: measurement direction: undercuts verified: full

Key figure: net sedimentation "only a few millimeters per millennium," with "dense accumulations of cephalopod conchs" showing "preferential alignment towards the south."

Establishes that density plus alignment plus large shells is not by itself a catastrophe signature.  Also supplies the positive discriminators of slow accumulation that Austin's bed has never been checked for: hardgrounds with vertical pits, macroborings, undistorted three-dimensional burrows, intraclasts, reworked fossils and ferruginous crusts.  Its manuscript p. 12 supplies the balancing point, that a slow formation can still contain rapidly deposited individual beds.  Read as the accepted manuscript;  its pagination is its own, not the journal's.

Postmortem transport in fossil and modern shelled cephalopods

Yacobucci, Margaret M.  PeerJ 6:e5909 (2018).  doi:10.7717/peerj.5909  CC-BY.

camp: mainstream topic: taphonomy method: measurement direction: supports verified: full

Low-inflation shells such as orthocones are unlikely to float far after death, and modern nautilids have small ranges and limited drift.  This closes off the "the shells drifted in over a long time" escape and supports Austin's reading that the animals lived where they are found.  It does not distinguish one burial from many at the same place.  peerj.com returns 403 to curl;  obtained as EuropePMC full-text XML.

Kröger & Rasmussen 2014 (Lethaia 47:275–295, doi:10.1111/let.12057); Kröger 2012 ("The 'Vaginaten'", GFF, doi:10.1080/11035897.2012.691897); Kröger 2015 (Palaeo3, "Mollusk maxima and marine events", doi:10.1016/j.palaeo.2015.08.018)

camp: mainstream topic: orthocone-analogue direction: — verified: none

Not obtained, re-chased and still closed as of 4 September 2026.  These are the papers most likely to carry a published orthocone density per square metre for the Baltoscandian condensed limestone, which is the one number that would make the slow-analogue comparison quantitative against Austin's one to two per square metre.  This is the largest single gap in the article's evidence.  Routes tried:  OpenAlex, Unpaywall and Semantic Scholar all return closed for all three DOIs;  the repository records OpenAlex lists for two of them (University of Copenhagen research profiles;  ZORA Zurich, DORA PSI and Lund LUP) were fetched with curl and carry metadata only, no file;  Helda, the University of Helsinki repository where Kröger works, returns nothing for the query.  Kröger and colleagues' 2011 Siljan paper, which is open and on disk, was grepped for "per m", "/m2", "density", "conchs per" and "packing" and gives no per-square-metre figure either.

Sedimentary Processes in Rayonnoceras Burial

Quinn, James H.  Fieldiana: Geology 33(27):511–519.  Chicago: Field Museum of Natural History, 24 June 1977.  doi:10.5962/bhl.title.5324  CC BY-NC-SA 3.0.

camp: mainstream topic: taphonomy direction: undercuts verified: full

Obtained 4 September 2026, and it changed the article.  This is the one published precedent Austin cites for upright Rayonnoceras, and reading the primary shows Austin's summary of it is wrong.  Quinn attributes the upright posture to buoyancy: the animal lays down ventral cameral calcite as ballast in life, so a dead shell "might float to the surface with the apex of the shell down, due to the ballast" and then "sink gently to the sea floor resting initially on the apex of the shell" (p. 512).  He rules out the violent option twice, at p. 517 and again in the summary at p. 519: "it is not feasible to assume they were overwhelmed by turbidity currents in the sense of turbulent sea-floor landslides."  His burial agent is a thixotropic clay flow that slows, stops and sets around a shell already lying dead on the bottom, and the gas explosion of the living chamber is a post-burial event that makes the pyritic goniatite halo, not the orientation.  Austin, p. 70, reports instead that Quinn "attributed upright orientation of Rayonnoceras to an abrupt thixotropic transition during a rapid, clay-rich, high-concentration sedimentation event."  That is Zangerl's reading, not Quinn's.  Two qualifications recorded in the article: Quinn's inclined shells sit at 30 to 65 degrees against Austin's steeper than 80, and Quinn's quick-clay mechanism needs clay that Austin's carbonate sand does not have.  Access route: the Biodiversity Heritage Library item PDF still returns 403 to curl, but the same scan is mirrored on archive.org as sedimentaryproce3327quin and downloads without a login.  Saved as sources/papers/quinn-1977_sedimentary-processes-rayonnoceras-burial.pdf;  printed folio = PDF page + 504.

Reyment 1970, "Vertically inbedded cephalopod shells," Palaeogeography, Palaeoclimatology, Palaeoecology 7(2):103–111; Reyment 1973, "Depth inferences from vertically imbedded cephalopods," Lethaia 6(3):217–225; Zangerl, Woodland, Richardson & Zachry 1969

camp: mainstream topic: taphonomy direction: — verified: citation

Not obtained, and not used.  Both Reyment papers are closed in OpenAlex, Unpaywall and Semantic Scholar, with no repository copy;  archive.org holds neither Stockholm Contributions in Geology nor the Uppsala Bulletin, and scholar.archive.org serves a challenge page to curl.  Austin does not cite Reyment anywhere — the name does not occur in his paper — so nothing in the article turns on them, and the point they would have supported is now made from Quinn's primary instead.  Zangerl et al. 1969 is reported through Austin's p. 70 and through Quinn's discussion of it, and is not quoted directly.

Wendt 1995 on Moroccan orthocone concentrations; Breed 1969 on the discovery of Nautiloid Canyon; Miller, Downs & Youngquist 1949 on Mississippian cephalopods

camp: mainstream topic: orthocone-analogue direction: mixed verified: citation

Not obtained;  reported through Austin 2003.  Wendt matters because Austin contrasts his quadrapolar pattern with the bipolar, wave-shoaled Moroccan pattern, and that contrast is one of the proposed orientation tests.  Breed is the original discovery note and is also Hill & Moshier's citation.

The stratigraphic frame

Stratified Rocks of the Grand Canyon

McKee, Edwin D.  Chapter B of The Colorado River Region and John Wesley Powell, U.S. Geological Survey Professional Paper 669 (1969).  Public domain.

https://pubs.usgs.gov/pp/0669/report.pdf

camp: agency topic: stratigraphy method: field survey direction: background verified: full

Supplies the four-member division of the Redwall and McKee's own statement that the members are lithologic units "independent of time units as shown by faunal zones."  That is what makes the proposed conodont test meaningful: the faunal zones already cut across the lithologic boundaries.  Page offset in the scan is 12.

History of the Redwall Limestone of northern Arizona, GSA Memoir 114

McKee, Edwin D. and Raymond C. Gutschick (1969).

camp: mainstream topic: stratigraphy direction: — verified: none

Not obtained, and this is a real limitation.  Absent from archive.org;  HathiTrust returns 403 to curl;  GSA Memoirs sit behind a GeoScienceWorld subscription.  Everything the article says about what this monograph does and does not record is quoted through Austin, who has an interest in the answer, and the article says so.  No page number from this monograph is printed.  Retry through bin/cdp-fetch.py on HathiTrust, or interlibrary loan.

Telling Time at Grand Canyon National Park: 2020 update

Karlstrom, Karl E., Laura J. Crossey, Allyson Mathis and Carl Bowman.  National Park Service NPS/GRCA/NRR—2021/2246.  doi:10.36967/nrr-2285173

camp: agency topic: stratigraphy method: review direction: background verified: full

Gives the conventional Redwall age of about 340 million years and states that it rests on fossil biozones, not on a radiometric date of the rock.  Used here only to be honest about how that age is obtained.

Sources used for the scope objection

These belong to the parent article and are catalogued in full on the Grand Canyon literature page.  Two are cited here because the article's answer to "one bed cannot prove a global Flood" needs them.

The Surprise Canyon Formation

Billingsley, George H. and Stanley S. Beus.  U.S. Geological Survey Bulletin 1605-A, pp. A27–A33 (1985).  Public domain.

https://pubs.usgs.gov/bul/1605a/report.pdf

camp: agency topic: mid-column method: field survey direction: undercuts verified: full

Valleys averaging 300 m wide and 75 m deep cut into the top of the Redwall, thickest section 122 m, filled with Lepidodendron logs, 22 palynomorph species, mud cracks, burrows and stromatolites, plus solution caves inside the Redwall itself.  Three formations above Austin's bed, in the same canyon.

Carboniferous chondrichthyan assemblages from the Surprise Canyon and Watahomigi formations

Hodnett, John-Paul M. and David K. Elliott.  Journal of Paleontology 92, Memoir 77, pp. 1–33 (2018).  doi:10.1017/jpa.2018.72  CC-BY.

https://npshistory.com/publications/grca/jp-92-77-2018.pdf

camp: mainstream topic: mid-column method: field survey direction: undercuts verified: full

Carries nine individually measured paleovalleys, 19.5 to 91.1 m deep and 92 to 425 m wide, quoted from Billingsley & Beus's 1999 Museum of Northern Arizona Bulletin 61.  Bulletin 61 itself is not online and was not obtained, so those dimensions reach the article at second hand.

Sand injectites at the base of the Coconino Sandstone, Grand Canyon, Arizona (USA)

Whitmore, John H. and Raymond Strom.  Sedimentary Geology 230(1–2):46–59 (2010).  doi:10.1016/j.sedgeo.2010.06.022

camp: creationist topic: venue method: field survey direction: background verified: full

Cited only as the worked example of creationist Grand Canyon fieldwork placed in a mainstream Elsevier journal under a Park Service permit, which is the answer to "mainstream geologists will not engage."  Note that the widely circulated DOI ending .019 is wrong.

What would change the article

1. A taphonomic survey of the Whitmore Nautiloid Bed scoring shell condition, encrustation, boring and geopetal fills. This would settle the article's central open question in either direction and does not exist.
2. A random-sample density count on measured full bedding-plane exposures. This would replace the "billions" estimate with a number and an error bar.
3. Quinn 1977 and Reyment 1970 first-hand. Done for Quinn, 4 September 2026, and it reversed the finding: Austin's p. 70 summary of Quinn is wrong, and Quinn's own explanation of upright Rayonnoceras is buoyancy with no flow. Reyment 1970 and 1973 remain closed, but Austin does not cite them and the article no longer needs them.
4. McKee & Gutschick 1969. The mainstream description of the Whitmore Wash Member should not reach a Berean article through the person arguing against it.
5. A published per-square-metre orthocone density for the Baltoscandian condensed limestone. Without it, the slow-analogue comparison stays qualitative.
6. Austin 2001, the ICR research proposal. It would explain, or fail to explain, where "four billion" came from.