south fork, Cheyenne River (Cretaceous to of the United States)

Also known as Archelon type

Where: Fall River County, South Dakota (43.2° N, 103.6° W: paleocoordinates 49.4° N, 73.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Pierre Shale Formation, Campanian to Campanian (83.6 - 66.0 Ma)

• "in the uppermost For Pierre or No. 4 of the Upper Cretaceous"

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

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

Primary reference: G. R. Wieland. 1896. Archelon ischyros: a ne gigantic cryptodire testudinate from the Fort Pierre Cretaceous of South Dakota. The American Journal of Science, series 4 2(12):399-412 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 167918: authorized by Matthew Carrano, entered by Matthew Carrano on 07.04.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Mollusca indet. Linnaeus 1758
"four or five species, poorly preserved"
Chondrichthyes
 Lamniformes - Lamnidae
Lamna sp. Cuvier 1816 mackerel shark
tooth
Osteichthyes
 Teleostomi -
Actinopteri
 Beryciformes - Berycidae
aff. Beryx sp. Cuvier 1829
scales
Reptilia
 Testudines - Protostegidae
Archelon ischyros n. gen. n. sp.
Archelon ischyros n. gen. n. sp. Wieland 1896 sea turtle
YPM