Elasmosaurus marshii type locality, Logan County (Cretaceous to of the United States)

Where: Kansas (39.0° N, 101.2° W: paleocoordinates 44.1° N, 68.9° W)

• coordinate based on nearby landmark

When: Niobrara Formation, Late/Upper Coniacian to Late/Upper Coniacian (89.3 - 70.6 Ma)

• "Chalk of Logan County" (Williston 1906, p. 229).

•"Niobrara Cretaceous" (Welles 1943, p. 189).

•"Probably the Smoky Hill Chalk Member (Santonian-Campanian)" (Storrs 1999, p. 7)

Environment/lithology: marine; chalk

Size class: macrofossils

Collected by Mr H. T. Martin in 1889

Collection methods: quarrying

Primary reference: S. W. Williston. 1906. North American plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus. The American Journal of Science, series 4 21:221-236 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 117842: authorized by Roger Benson, entered by Roger Benson on 27.09.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sauropterygia - Elasmosauridae
"Elasmosaurus marshii n. sp." = Thalassonomosaurus marshii
"Elasmosaurus marshii n. sp." = Thalassonomosaurus marshii Williston 1906 elasmosaur
YPM 1645 (holotype)