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



Justin Tweet, thank you for the link

Any chance of listing of the Western Interior Seaway for Early Cretaceous (Albian and Aptian) Ammonite/Inoceramid biozones or even subzones


Thank you


On March 27, 2021 at 2:09 PM Justin Tweet <thescelosaurus@gmail.com> wrote:

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"  (gulf, southern , central and northern interior subprovinces)  125 - 93.5 mya.


References:

E G Kauffman, Brad Sageman, James I. Kirkland and Will Elder, 1993. "Molluscan biostratigraphy of the Cretaceous Western Interior Basin, North America" Geological Association of Canada - Special Paper39:397-434. In book: Evolution of the Western Interior Basin (pp.397-434)
 


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Justin Tweet
Equatorial Minnesota, home of The Compact Thescelosaurus