SE of Pierre (Cretaceous of the United States)

Also known as Big Bend along the Missouri River

Where: Hughes County, South Dakota (44.5° N, 100.4° W: paleocoordinates 49.6° N, 67.8° W)

• coordinate stated in text

• small collection-level geographic resolution

When: DeGrey Member (Pierre Shale Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• "DeGrey Member, Lower Pierre Shale, South Dakota" (1967); earlier listed as from the Ocama Mbr.

• bed-level stratigraphic resolution

Environment/lithology: marine; shale

Size class: macrofossils

• "includes quadrate, three anterior dorsal vertebrae, and both scapulo-coracoids"

Collected by D. R. Crandell 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 107704: authorized by Matthew Carrano, entered by Hallie Street on 14.04.2011, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)

Taxonomic list

• Specimen named Plioplatecarpus primaevus as a new species in 1967, but the name given to the same specimen in 1964 (Plioplatecarpus houzeaui) not listed in the synonymy.
Reptilia
 Squamata - Mosasauridae
Mosasaurus missouriensis n. sp. Harlan 1834 mosasaur
MNHN 9587, anterior fragment of the premaxilla; RFWUIP 1327
Plioplatecarpus primaevus n. sp. Russell 1967 mosasaur
USNM 18254