Missouri River valley near Yankton (Cretaceous of the United States)

Where: Yankton County, South Dakota (42.9° N, 97.4° W: paleocoordinates 47.2° N, 64.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Sharon Springs Member (Pierre Shale Formation), Campanian (83.6 - 72.1 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

Size class: macrofossils

Collected by Simpson in 1948; reposited in the USNM

Primary reference: D. A. Russell. 1964. The Skull of American Mosasaurs. 1-386 [M. Carrano/H. Street/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 107674: authorized by Matthew Carrano, entered by Hallie Street on 13.04.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Squamata - Mosasauridae
"Platecarpus ictericus" = Platecarpus tympaniticus
"Platecarpus ictericus" = Platecarpus tympaniticus Cope 1869 mosasaur
USNM 18256, partial skull