PBDB Collection

Elk Creek (100 m): Wasatchian, Wyoming

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Multituberculata - Eucosmodontidae

	Neoliotomus ultimus (Granger and Simpson 1928)
	described by Krause 1982 from YPM 90b and 119
Mammalia - Leptictidae

	Prodiacodon tauricinerei (Jepsen 1930)

	Didelphodus absarokae (Cope 1881)
Mammalia - Macroscelidea - Apheliscidae

	Haplomylus speirianus (Cope 1880)

	Apheliscus sp. Cope 1875
	"wapitiensis/insidiosus"
Mammalia - Condylarthra - Hyopsodontidae

	Hyopsodus sp. Leidy 1870
	"loomisi/minor"
Mammalia - Rodentia - Ischyromyidae

	Paramys cf. excavatus Loomis 1907

	Paramys cf. copei Loomis 1907
Mammalia - Rodentia - Sciuravidae

	Dawsonomys minor Wood 1965
	= cf. Knightomys minor Wood 1965	Alroy 2002

	cf. Knightomys depressus (Loomis 1907)
Mammalia - Primates - Microsyopidae

	Microsyops sp. Leidy 1872
	= Microsyopidae indet. Osborn and Wortman 1892	Alroy 2002
Mammalia - Primates - Omomyidae

	Tetonoides tenuiculus (Jepsen 1930)
	= Teilhardina sp. Simpson 1940	Bown and Rose 1987
	T. crassidens-americana intergrade; Y-119, 203, 205

	Tetonius homunculus (Cope 1882)
	= Tetonius sp. Matthew 1915	Alroy 2002
Mammalia - Primates - Notharctidae

	Pelycodus sp. Cope 1875
	= Cantius sp. Simons 1962	Alroy 2002
	"mckennai/trigonodus"
Mammalia - Primates - Paromomyidae

	Ignacius graybullianus Bown and Rose 1976

	Phenacolemur praecox Matthew 1915
	= Phenacolemurinae indet. Simpson 1955	Alroy 2002

	Phenacolemur simonsi Bown and Rose 1976
Mammalia - Pantolestidae

	Palaeosinopa veterrima Matthew 1901
Mammalia

	Uintacyon massetericus (Cope 1882)
Mammalia - Viverravidae

	Viverravus sp. Marsh 1872
	"V. acutus/gracilis"

	Viverravus sp. Marsh 1872
	"2"

	Didymictis leptomylus Cope 1880
Mammalia - Creodonta - Oxyaenidae

	Oxyaena gulo Matthew and Granger 1915
	listed also by Gunnell and Gingerich 1991
Mammalia - Creodonta - Hyaenodontidae

	Arfia opisthotoma (Matthew 1901)
	= Arfia sp. Van Valen 1965	Alroy 2002

	Prototomus sp. Cope 1874
	"1"
Mammalia - Creodonta

	Prolimnocyon atavus Matthew and Granger 1915
Mammalia - Acreodi - Mesonychidae

	Pachyaena ossifraga Cope 1874
Mammalia - Perissodactyla - Equidae

	Hyracotherium grangeri Gingerich 1989
	"H. sp. 1"
Mammalia - Phenacodontidae

	Ectocion osbornianus (Cope 1882)

	Phenacodus primaevus (Cope 1873)
	= Phenacodus sp. Cope 1873	Alroy 2002

	Phenacodus vortmani (Cope 1880)

	Phenacodus intermedius Granger 1915

	Phenacodus brachypternus Cope 1882
	= Copecion brachypternus Cope 1882	Alroy 2002
Mammalia - Procreodi - Arctocyonidae

	Chriacus gallinae Matthew and Granger 1915

	Thryptacodon antiquus Matthew and Granger 1915
Mammalia - Diacodexeidae

	Diacodexis metsiacus (Cope 1882)
	= Diacodexis sp. Cope 1882	Alroy 2002
Mammalia - Coryphodontidae

	Coryphodon sp. (Owen 1845)
	"2"

	Coryphodon sp. (Owen 1845)
	"1"
Mammalia - Esthonychidae

	Esthonyx spatularius Cope 1880
Mammalia

	Esthonyx grangeri Simpson 1937
see common names

Geography

Country:	United States	State/province:	Wyoming	County:	Big Horn
Coordinates:	44.5° North, 108.0° West (view map)
Paleocoordinates:	52.2° North, 79.9° West (Wright 2013)
Basis of coordinate:	based on political unit
Geographic resolution:	small collection

Time

Period:	Paleogene	Epoch:	Eocene
Stage:	Ypresian	10 m.y. bin:	Cenozoic 2
*Period:	Tertiary
Key time interval:	Wasatchian
Age range of interval:	54.9 - 50.5 m.y. ago
* legacy (obsolete) database fields

Stratigraphy

Formation:	Willwood
Local section:	ElkCr	Local bed:	100 m
Local order:	bottom to top

Lithology and environment

Environment:

terrestrial indet.

Taphonomy

Modes of preservation:

body

Collection methods and comments

Reason for describing collection:	biostratigraphic analysis
Taxonomic list comments:all of the YPM localities are in Big Horn County

Metadata

Also known as:	YPM 90b, 90c, 119, 120, 201, 202, 203, 204, 205
Database number:	15507
Authorizer:	J. Alroy	Enterer:	J. Alroy
Research group:	vertebrate
Created:	1993-02-18 00:00:00	Last modified:	2025-02-22 15:12:02
Access level:	the public	Released:	1993-02-18 00:00:00
Creative Commons license:	CC0

Reference information

Primary reference:

3021.

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]

Secondary references:

6294		J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
1123		T. M. Bown and K. D. Rose. 1987. Patterns of Dental Evolution in Early Eocene Anaptomorphine Primates (Omomyidae) from the Bighorn Basin, Wyoming. Paleontological Society Memoir 23:1-162 [J. Alroy/J. Alroy/J. Ju]