Where: Copan County, Oklahoma (36.9° N, 95.9° W: paleocoordinates 4.2° S, 29.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Barnsdall Formation, Missourian (305.9 - 303.4 Ma)

• Lower Barnsdall Fm (Eudora Shale)

Environment/lithology: marine; lithology not reported

Primary reference: B. Kröger and R. H. Mapes. 2005. Revision of some common Carboniferous genera of North American orthocerid nautiloids. Journal of Paleontology 79(5):1002-1011 [M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 92578: authorized by Björn Kröger, entered by Björn Kröger on 18.11.2009