FG-31 (Eocene of the United States)

Where: Wyoming (44.6° N, 108.5° W: paleocoordinates 49.4° N, 91.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Willwood Formation, Wasatchian (55.8 - 50.3 Ma)

• Wa-2

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; lithified siliciclastic sediments

Size classes: macrofossils, mesofossils

Reposited in the UMMP

Collection methods: surface (float), surface (in situ),

Primary reference: W. C. Clyde. 1997. Stratigraphy and mammalian paleontology of the McCullough Peaks, northern Bighorn Basin, Wyoming: Implications for biochronology, basin development, and community reorganization across the Paleocene-Eocene boundary. PhD Thesis, University of Michigan [W. Clyde/W. Clyde/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 46644: authorized by Will Clyde, entered by Will Clyde on 24.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Multituberculata -
Neoliotomus ultimus Granger and Simpson 1928 multituberculate
 Rodentia - Ischyromyidae
Acritoparamys atwateri Loomis 1907 rodent
 Primates - Microsyopidae
"Haplomylus speirianus" = Microsyops speirianus
"Haplomylus speirianus" = Microsyops speirianus Cope 1880 primate
 Primates - Notharctidae
Cantius mckennai Gingerich and Simons 1977 primate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri
"Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse
 Theriamorpha - Phenacodontidae
Ectocion osbornianus Cope 1882 condylarth
Phenacodus intermedius Granger 1915 condylarth
 Artiodactyla - Diacodexeidae
Diacodexis metsiacus Cope 1882 even-toed ungulate
 Theriamorpha - Viverravidae
Didymictis protenus Cope 1874 placental
Viverravus acutus Matthew and Granger 1915 placental
 Condylarthra - Hyopsodontidae
Hyopsodus pauxillus Gingerich 1994 condylarth
Hyopsodus loomisi McKenna 1960 condylarth
 Cimolesta - Pantolestidae
Palaeosinopa incerta Bown and Schankler 1982 eutherian
 Cimolesta - Coryphodontidae
Coryphodon eocaenus Owen 1846 pantodont
Reptilia
 Squamata - Anguidae
Xestops sp. Cope 1873 squamates
 Crocodylia - Alligatoridae
Allognathosuchus sp. Mook 1921 crocodilian