UCMP V88046 Coke's Clemmys (Paleocene of the United States)

Also known as UWBM C1908

Where: McCone County, Montana (47.6° N, 106.2° W: paleocoordinates 53.8° N, 81.0° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Tullock Member (Fort Union Formation), Puercan (66.0 - 63.3 Ma)

• The Coke’s Clemmys fossil locality (CC) is ~10.3 m above the top of the MCZ coal and is directly on top of the 2330 coal (Fig.  2). Between

•the MCZ and the 2330 coal at this locality is ~10 m of alternating siltstone and mudstone ...the 2330 coal, which here is ~0.5 m

•thick and contains one tephra (bentonite) layer that was sampled for 40Ar/39Ar analysis and dated to 65.802+/- 0.116 Ma.

Environment/lithology: fluvial; sandstone

• within a cross-bedded sandstone at the base of the channel deposit. The channel locally cuts down into the 2330 coal

Size class: macrofossils

Reposited in the ROM, UCMP, UWBM

Collection methods: surface (float), sieve,

• via

•surface collection and underwater screenwashing

•of fossiliferous sediment over the course

•of several field seasons (in the 1980s and early

•1990s by UCMP and RAM field crews led by Lofgren and in the 2010s by UWBM field crews led by Smith and Wilson)

Primary reference: S. M. Smith, C. J. Sprain, W. A. Clemens, D.L. Lofgren, P. R. Renne and G. P. Wilson. 2018. Early mammalian recovery after the end-Cretaceous mass extinction: A high-resolution view from McGuire Creek area, Montana, USA . Geological Society America Bulletin [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 193844: authorized by Patricia Holroyd, entered by Patricia Holroyd on 06.06.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Cimolesta - Cimolestidae
Procerberus formicarum Sloan and Van Valen 1965 eutherian
 Primates -
Purgatorius cf. coracis Fox and Scott 2011 primate
 Tribosphenida - Periptychidae
Mimatuta sp. Van Valen 1978 condylarth
Mimatuta minuial Van Valen 1978 condylarth
 Tribosphenida - Arctocyonidae
Oxyprimus erikseni Van Valen 1978 condylarth
Protungulatum donnae Sloan and Van Valen 1965 condylarth
 Multituberculata -
Cimexomys minor Sloan and Van Valen 1965 multituberculate
 Multituberculata - Eucosmodontidae
"Cimexomys gratus" = Stygimys gratus
"Cimexomys gratus" = Stygimys gratus Jepsen 1930 multituberculate
 Multituberculata - Neoplagiaulacidae
Mesodma sp. Jepsen 1940 multituberculate
Mesodma hensleighi Lillegraven 1969 multituberculate
Mesodma thompsoni Clemens 1964 multituberculate
Mesodma formosa Marsh 1889 multituberculate