West side of Sand Creek, Smoky Hill River (Cretaceous to of the United States)

Also known as Platecarpus planifrons referred material

Where: Gove County, Kansas (38.7° N, 100.2° W: paleocoordinates 41.5° N, 66.6° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Smoky Hill Chalk Member (Niobrara Formation), Late/Upper Coniacian to Late/Upper Coniacian (89.3 - 83.5 Ma)

• low in formation, below Hattin's Marker Unit 3

• bed-level stratigraphic resolution

Environment/lithology: marine; chalk

Size class: macrofossils

Primary reference: T. Konishi and M. W. Caldwell. 2007. New specimens of Platecarpus planifrons (Cope, 1874) (Squamata: Mosasauridae) and a revised taxonomy of the genus. Journal of Vertebrate Paleontology 27(1):59-72 [M. Carrano/H. Street/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123574: authorized by Philip Mannion, entered by Philip Mannion on 26.01.2012, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines - Pancheloniidae
Ctenochelys stenoporus Hay 1905 turtle
USNM 357166, juvenile specimen
 Squamata - Mosasauridae
Platecarpus planifrons Cope 1874 mosasaur
UALVP 24240 (articulated skull, lower jaws, atlas and axis) and UALVP 40402 (disarticulated skull and lower jaw bones with four anterior cervical vertebrae)