PBDB Collection

Elk Creek (450 m) (Eocene of the United States)

Also known as YPM 51, 65, 78, 222, 223, 237, 247, 261, 267, 340-S, USGS D-1599 (449 m)

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 15542: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• USGS D-1599 is from Washakie County

Show authors, comments, and common names

Mammalia
Condylarthra - Hyopsodontidae	Hyopsodus sp., Hyopsodus sp. Hyopsodus sp. Leidy 1870 condylarth "latidens/miticulus" Hyopsodus sp. Leidy 1870 condylarth "loomisi/minor"
Rodentia - Ischyromyidae	Paramys cf. excavatus Paramys cf. excavatus Loomis 1907 rodent
Primates - Omomyidae	Steinius vespertinus², Absarokius metoecus² Steinius vespertinus² Matthew 1915 tarsier Y-340-S Absarokius metoecus² Bown and Rose 1987 tarsier USGS D-1599
Primates - Microsyopidae	Microsyopidae indet.¹ Microsyopidae indet.¹ Osborn and Wortman 1892 primate
Primates - Paromomyidae	Phenacolemurinae indet. Phenacolemurinae indet. Simpson 1955 primate "Phenacolemur sp. 1"
Primates - Notharctidae	Cantius abditus¹ Cantius abditus¹ Gingerich and Simons 1977 primate
Ferae -	Vulpavus australis, Uintacyon asodes, Vassacyon promicrodon Vulpavus australis Matthew and Granger 1915 placental Uintacyon asodes Gazin 1952 placental Vassacyon promicrodon Wortman and Matthew 1899 placental
Ferae - Viverravidae	Didymictis sp. Didymictis sp. Cope 1875 placental "curtidens/lysitensis"
Creodonta - Oxyaenidae	Oxyaena sp. Oxyaena sp. Cope 1874 creodont "intermedia/forcipata"
Creodonta -	Prolimnocyon atavus Prolimnocyon atavus Matthew and Granger 1915 creodont
Procreodi - Arctocyonidae	Anacodon ursidens Anacodon ursidens Cope 1882 condylarth
Perissodactyla - Equidae	"Hyracotherium grangeri" = Sifrhippus grangeri, "Hyracotherium aemulor" = Arenahippus aemulor "Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse "H. sp. 1" "Hyracotherium aemulor" = Arenahippus aemulor Gingerich 1991 horse "H. sp. 2"
Perissodactyla -	Systemodon sp.⁴ Systemodon sp.⁴ Cope 1881 odd-toed ungulate USGS, locality not stated
Tribosphenida - Phenacodontidae	Copecion brachypternus¹, Phenacodus sp.¹ Copecion brachypternus¹ Cope 1882 condylarth Phenacodus sp.¹ Cope 1873 condylarth
Artiodactyla - Diacodexeidae	Diacodexis sp.¹, Bunophorus sp.¹ Diacodexis sp.¹ Cope 1882 even-toed ungulate Bunophorus sp.¹ Sinclair 1914 even-toed ungulate
Tribosphenida - Pantolestoidae	Palaeosinopa lutreola, Palaeosinopa veterrima, Palaeosinopa incerta³ Palaeosinopa lutreola Matthew 1918 placental Palaeosinopa veterrima Matthew 1901 placental Palaeosinopa incerta³ Bown and Schankler 1982 placental "P. sp. 1"
Cimolesta - Esthonychidae	Esthonyx sp., Esthonyx bisulcatus Esthonyx sp. Cope 1874 tillodont "1" Esthonyx bisulcatus Cope 1874 tillodont
Cimolesta - Coryphodontidae	Coryphodon sp. Coryphodon sp. Owen 1845 pantodont "2"

¹Alroy 2002; ²Bown and Rose 1987; ³Bown and Schankler 1982; ⁴Froehlich 1999