PBDB Collection

Elk Creek (630 m) (Eocene of the United States)

Also known as YPM 9, 10, 22, 188, 187

Where: Big Horn County, Wyoming (44.5° N, 108.0° W: paleocoordinates 49.2° N, 90.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

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

Environment/lithology: terrestrial

Primary reference: D. M. Schankler. 1980. Faunal Zonation of the Willwood Formation in the Central Bighorn Basin, Wyoming. University of Michigan Papers on Paleontology 24:99-114 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 15560: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• tuff at 634 m dated at 52.8 +/- 0.3 Ma (Ar-Ar) by Wing et al. 1991
YPM 187 and 188 are in Washakie County, the others are in Big Horn County

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Mammalia
Condylarthra - Hyopsodontidae	Hyopsodus sp., Hyopsodus sp., Hyopsodus powellianus Hyopsodus sp. Leidy 1870 condylarth "latidens/miticulus" Hyopsodus sp. Leidy 1870 condylarth "loomisi/minor" Hyopsodus powellianus Cope 1884 condylarth
Theriamorpha -	Uintacyon asodes, Vulpavus canavus, Vulpavus australis Uintacyon asodes Gazin 1952 placental Vulpavus canavus Cope 1881 placental Vulpavus australis Matthew and Granger 1915 placental
Theriamorpha - Viverravidae	Didymictis sp. Didymictis sp. Cope 1875 placental "curtidens/lysitensis"
Creodonta - Hyaenodontidae	Tritemnodon strenuus¹, Prototomus sp. Tritemnodon strenuus¹ Cope 1875 creodont Prototomus sp. Cope 1874 creodont "1"
Artiodactyla - Diacodexeidae	"Bunophorus" macropternus, Diacodexis sp.¹ "Bunophorus" macropternus Cope 1882 even-toed ungulate Diacodexis sp.¹ Cope 1882 even-toed ungulate
Perissodactyla - Equidae	"Hyracotherium grangeri" = Sifrhippus grangeri "Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse "H. sp. 1"
Perissodactyla -	Heptodon calciculus Heptodon calciculus Cope 1880 odd-toed ungulate
Rodentia - Ischyromyidae	Paramys cf. copei, Paramys cf. excavatus Paramys cf. copei Loomis 1907 rodent Paramys cf. excavatus Loomis 1907 rodent
Primates - Paromomyidae	Phenacolemurinae indet. Phenacolemurinae indet. Simpson 1955 primate "Phenacolemur sp. 2"
Primates - Microsyopidae	Microsyopidae indet.¹ Microsyopidae indet.¹ Osborn and Wortman 1892 primate
Primates - Notharctidae	Cantius abditus¹ Cantius abditus¹ Gingerich and Simons 1977 primate
Primates - Omomyidae	Absarokius abbotti² Absarokius abbotti² Loomis 1906 tarsier Y-187
Theriamorpha - Leptictidae	Didelphodus absarokae Didelphodus absarokae Cope 1881 eutherian
Cimolesta - Esthonychidae	Esthonyx bisulcatus Esthonyx bisulcatus Cope 1874 tillodont
Cimolesta - Coryphodontidae	Coryphodon sp. Coryphodon sp. Owen 1845 pantodont "2"

¹Alroy 2002; ²Bown and Rose 1987