Re: [dinosaur] Ammonite biozones for the Western Interior Seaway

To: John Schneiderman <john-schneiderman@cox.net>

Subject: Re: [dinosaur] Ammonite biozones for the Western Interior Seaway

From: Justin Tweet <thescelosaurus@gmail.com>

Date: Sat, 27 Mar 2021 15:09:15 -0500

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Reply-to: Justin Tweet <thescelosaurus@gmail.com>

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You might find something useful in the 2020 "Geologic Time Scale" volume. Both the 2012 full and 2016 concise versions include North American ammonite and inoceramid biozones in a figure, from the Maastrichtian into the Cenomanian. I think they would both be revised versions of the scheme in USGS Open-File Report 2006-1250, available at https://pubs.er.usgs.gov/publication/ofr20061250.

Gradstein, F. M., J. G. Ogg, M. D. Schmitz, and G. M. Ogg, editors. 2020. Geologic time scale 2020. Elsevier, Amsterdam, Netherlands.

-Justin

On Sat, Mar 27, 2021 at 2:05 PM John Schneiderman <john-schneiderman@cox.net> wrote:

Seeking information on the current Ammonite/Inocermus biozones for the Western Interior Seaway, especially for the mid-cretaceous / "Comanchean"Â (gulf, southern , central and northern interior subprovinces)Â 125 - 93.5 mya.

References:

E G Kauffman,ÂBrad Sageman,ÂJames I. KirklandÂand Will Elder, 1993. "Molluscan biostratigraphy of the Cretaceous Western Interior Basin, North America"ÂGeological Association of Canada - Special Paper39:397-434. In book: Evolution of the Western Interior Basin (pp.397-434)

Justin Tweet

Equatorial Minnesota, home of The Compact Thescelosaurus