Long Lake (Cretaceous of the United States)

Also known as Compsemys victa type

Where: North Dakota (46.7° N, 100.3° W: paleocoordinates 52.2° N, 73.2° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Hell Creek Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Probable Laramie age (Hay, 1908, p. 233). As noted by Gaffney (1972) this horizon is most likely late Cretaceous. The shallow water marine Fox Hills Formation and the overlying Hell Creek Formation are exposed around Long Lake (Bluemle, 1977). Given that there are only a few vertebrate fossils known from the Fox Fills Formation and that the holotype is preserved much like fossils from the Hell Creek Formation, we are confident in constraining the provenance of this fossil to the Hell Creek Formation.

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Reposited in the USNM

Primary reference: T. R. Lyson and W. G. Joyce. 2011. Cranial anatomy and phylogenetic placement of the enigmatic turtle Compsemys victa Leidy, 1856. Journal of Paleontology 85(4):789-801 [R. Benson/R. Benson]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 127733: authorized by Roger Benson, entered by Roger Benson on 22.05.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines - Trionychidae
"Aspideretes foveatus" = Trionyx foveatus
"Aspideretes foveatus" = Trionyx foveatus Leidy 1856 softshell turtle
USNM 990, a fragment of the right last costal plate found 'near Long Lake' by Dr. F. V. Hayden
 Testudines - Compsemydidae
"Compsemys victa n. gen. n. sp." = Compsemys victa, "Emys obscurus n. sp." = Compsemys victa
"Compsemys victa n. gen. n. sp." = Compsemys victa Leidy 1856 turtle
USNM 960
"Emys obscurus n. sp." = Compsemys victa Leidy 1856 turtle
Lost type found by Dr. F. V. Hayden at Long Lake