PBDB Collection

Elk Creek (100 m) (Eocene of the United States)

Also known as YPM 90b, 90c, 119, 120, 201, 202, 203, 204, 205

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 15507: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• all of the YPM localities are in Big Horn County

Show authors, comments, and common names

Mammalia
Theriamorpha - Leptictidae	Prodiacodon tauricinerei, Didelphodus absarokae Prodiacodon tauricinerei Jepsen 1930 eutherian Didelphodus absarokae Cope 1881 eutherian
Cimolesta - Coryphodontidae	Coryphodon sp., Coryphodon sp. Coryphodon sp. Owen 1845 pantodont "2" Coryphodon sp. Owen 1845 pantodont "1"
Cimolesta - Esthonychidae	Esthonyx spatularius Esthonyx spatularius Cope 1880 tillodont
Cimolesta -	"Esthonyx grangeri" = Azygonyx grangeri "Esthonyx grangeri" = Azygonyx grangeri Simpson 1937 tillodont
Condylarthra - Hyopsodontidae	Hyopsodus sp. Hyopsodus sp. Leidy 1870 condylarth "loomisi/minor"
Macroscelidea - Apheliscidae	Apheliscus sp., Haplomylus speirianus Apheliscus sp. Cope 1875 elephant shrew "wapitiensis/insidiosus" Haplomylus speirianus Cope 1880 elephant shrew
Acreodi - Mesonychidae	Pachyaena ossifraga Pachyaena ossifraga Cope 1874 condylarth
Theriamorpha - Phenacodontidae	Ectocion osbornianus, Copecion brachypternus¹, Phenacodus sp.¹, Phenacodus vortmani, Phenacodus intermedius Ectocion osbornianus Cope 1882 condylarth Copecion brachypternus¹ Cope 1882 condylarth Phenacodus sp.¹ Cope 1873 condylarth Phenacodus vortmani Cope 1880 condylarth Phenacodus intermedius Granger 1915 condylarth
Perissodactyla - Equidae	"Hyracotherium grangeri" = Sifrhippus grangeri "Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse "H. sp. 1"
Procreodi - Arctocyonidae	Chriacus gallinae, Thryptacodon antiquus Chriacus gallinae Matthew and Granger 1915 condylarth Thryptacodon antiquus Matthew and Granger 1915 condylarth
Artiodactyla - Diacodexeidae	Diacodexis sp.¹ Diacodexis sp.¹ Cope 1882 even-toed ungulate
Theriamorpha - Viverravidae	Viverravus sp., Viverravus sp., Didymictis leptomylus Viverravus sp. Marsh 1872 placental "V. acutus/gracilis" Viverravus sp. Marsh 1872 placental "2" Didymictis leptomylus Cope 1880 placental
Theriamorpha -	Uintacyon massetericus Uintacyon massetericus Cope 1882 placental
Creodonta - Oxyaenidae	Oxyaena gulo Oxyaena gulo Matthew and Granger 1915 creodont listed also by Gunnell and Gingerich 1991
Creodonta -	Prolimnocyon atavus Prolimnocyon atavus Matthew and Granger 1915 creodont
Creodonta - Hyaenodontidae	Prototomus sp., Arfia sp.¹ Prototomus sp. Cope 1874 creodont "1" Arfia sp.¹ Van Valen 1965 creodont
Theriamorpha - Pantolestoidae	Palaeosinopa veterrima Palaeosinopa veterrima Matthew 1901 placental
Rodentia - Sciuravidae	cf. Knightomys depressus, cf. Knightomys minor¹ cf. Knightomys depressus Loomis 1907 rodent cf. Knightomys minor¹ Wood 1965 rodent
Rodentia - Ischyromyidae	Paramys cf. excavatus, Paramys cf. copei Paramys cf. excavatus Loomis 1907 rodent Paramys cf. copei Loomis 1907 rodent
Primates - Paromomyidae	Ignacius graybullianus, Phenacolemurinae indet.¹, Phenacolemur simonsi Ignacius graybullianus Bown and Rose 1976 primate Phenacolemurinae indet.¹ Simpson 1955 primate Phenacolemur simonsi Bown and Rose 1976 primate
Primates - Omomyidae	Teilhardina sp.², Tetonius sp.¹ Teilhardina sp.² Simpson 1940 tarsier Tetonius sp.¹ Matthew 1915 tarsier
Primates - Notharctidae	Cantius sp.¹ Cantius sp.¹ Simons 1962 primate
Primates - Microsyopidae	Microsyopidae indet.¹ Microsyopidae indet.¹ Osborn and Wortman 1892 primate
Multituberculata - Eucosmodontidae	"Neoliotomus ultimus" = Eucosmodon ultimus "Neoliotomus ultimus" = Eucosmodon ultimus Granger and Simpson 1928 multituberculate described by Krause 1982 from YPM 90b and 119

¹Alroy 2002; ²Bown and Rose 1987