east side, Cheyenne River (Cretaceous of the United States)

Where: Shannon County, South Dakota (43.6° N, 102.8° W: paleocoordinates 49.2° N, 69.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• "uppermost Fort Pierre Cretaceous, just beneath the Miocene or White River Formation"

• bed-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Collected by G. R. Wieland in 1898; reposited in the YPM

Collection methods: mechanical,

Primary reference: G. R. Wieland. 1900. The skull, pelvis, and probable relationships of the huge turtles of the genus Archelon from the Fort Pierre Cretaceous of South Dakota. The American Journal of Science, series 4 9(52):237-251 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 154803: authorized by Matthew Carrano, entered by Matthew Carrano on 13.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Protostegidae
"Archelon marshii n. sp." = Protostega marshii
"Archelon marshii n. sp." = Protostega marshii Wieland 1900 sea turtle
YPM 294