PBDB Collection

Elk Creek (140 m) (Eocene of the United States)

Also known as YPM 92, 93, 94, 96, 97, 97a, 104, 106, 206, 207, 341, 346, 358, 359, 382, 383, USGS 1640

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 15510: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• all of these localities are in Big Horn County

Show authors, comments, and common names

Mammalia
Cimolesta - Coryphodontidae	Coryphodon sp., Coryphodon sp. Coryphodon sp. Owen 1845 pantodont "2" Coryphodon sp. Owen 1845 pantodont "1"
Cimolesta - Apatemyidae	Labidolemur kayi⁴ Labidolemur kayi⁴ Simpson 1929 eutherian "Apatemys DUPLICATE REF 1645 or 1646 or 1647 or 1648 or 1649
Cimolesta - Esthonychidae	Esthonyx spatularius Esthonyx spatularius Cope 1880 tillodont
Cimolesta -	"Esthonyx grangeri" = Azygonyx grangeri "Esthonyx grangeri" = Azygonyx grangeri Simpson 1937 tillodont
Macroscelidea - Amphilemuridae	Macrocranion nitens Macrocranion nitens Matthew 1918 elephant shrew
Macroscelidea - Apheliscidae	Haplomylus speirianus, Apheliscus sp. Haplomylus speirianus Cope 1880 elephant shrew Apheliscus sp. Cope 1875 elephant shrew "wapitiensis/insidiosus"
Condylarthra - Hyopsodontidae	Hyopsodus sp. Hyopsodus sp. Leidy 1870 condylarth "loomisi/minor"
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	Tetonius matthewi², Teilhardina sp.² Tetonius matthewi² Bown and Rose 1987 tarsier Teilhardina sp.² Simpson 1940 tarsier
Primates - Microsyopidae	Microsyopidae indet.¹, Niptomomys doreenae Microsyopidae indet.¹ Osborn and Wortman 1892 primate Niptomomys doreenae McKenna 1960 primate
Primates - Micromomyidae	Tinimomys graybulliensis Tinimomys graybulliensis Szalay 1974 primate
Primates - Notharctidae	Cantius sp.¹ Cantius sp.¹ Simons 1962 primate
Dermoptera -	Plagiomene multicuspis Plagiomene multicuspis Matthew 1918 colugo
Rodentia - Paramyidae	Franimys amherstensis Franimys amherstensis Wood 1962 rodent
Rodentia - Ischyromyidae	Paramys cf. excavatus, Paramys cf. copei Paramys cf. excavatus Loomis 1907 rodent Paramys cf. copei Loomis 1907 rodent
Rodentia - Sciuravidae	Sciuravidae indet., cf. Knightomys minor¹, cf. Knightomys depressus Sciuravidae indet. Miller and Gidley 1918 rodent "1" cf. Knightomys minor¹ Wood 1965 rodent cf. Knightomys depressus Loomis 1907 rodent
Ferae - Metacheiromyidae	Palaeanodon sp., Palaeanodon ignavus Palaeanodon sp. Matthew 1918 placental "1" Palaeanodon ignavus Matthew 1918 placental
Creodonta - Oxyaenidae	Oxyaena sp., Oxyaena gulo, Palaeonictis occidentalis Oxyaena sp. Cope 1874 creodont "intermedia/forcipata" Oxyaena gulo Matthew and Granger 1915 creodont Palaeonictis occidentalis Osborn 1892 creodont
Creodonta -	Prolimnocyon atavus Prolimnocyon atavus Matthew and Granger 1915 creodont
Creodonta - Hyaenodontidae	Arfia shoshoniensis⁵, Prototomus sp. Arfia shoshoniensis⁵ Matthew and Granger 1915 creodont Prototomus sp. Cope 1874 creodont "1"
Ferae -	Uintacyon massetericus Uintacyon massetericus Cope 1882 placental
Ferae - Viverravidae	Viverravus sp., Viverravus sp., Viverravus sp., Didymictis leptomylus Viverravus sp. Marsh 1872 placental "V. acutus/gracilis" Viverravus sp. Marsh 1872 placental "2" Viverravus sp. Marsh 1872 placental "3" Didymictis leptomylus Cope 1880 placental
Acreodi - Mesonychidae	Pachyaena gracilis⁶, Pachyaena ossifraga Pachyaena gracilis⁶ Matthew and Granger 1915 condylarth USGS D-1640, 140 m level Pachyaena ossifraga Cope 1874 condylarth
Tribosphenida - Phenacodontidae	Phenacodus vortmani, Phenacodus intermedius, Copecion brachypternus¹, Ectocion osbornianus Phenacodus vortmani Cope 1880 condylarth Phenacodus intermedius Granger 1915 condylarth Copecion brachypternus¹ Cope 1882 condylarth Ectocion osbornianus 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"
Procreodi - Arctocyonidae	Thryptacodon antiquus Thryptacodon antiquus Matthew and Granger 1915 condylarth
Artiodactyla - Diacodexeidae	Diacodexis sp.¹ Diacodexis sp.¹ Cope 1882 even-toed ungulate
Tribosphenida -	Talpavoides dartoni³ Talpavoides dartoni³ Bown and Schankler 1982 placental YPM 104; "Dormaaliidae indet."
Tribosphenida - Pantolestoidae	Palaeosinopa incerta³, Palaeosinopa veterrima, Palaeosinopa lutreola Palaeosinopa incerta³ Bown and Schankler 1982 placental "P. sp. 1" Palaeosinopa veterrima Matthew 1901 placental Palaeosinopa lutreola Matthew 1918 placental
Soricomorpha - Geolabididae	Centetodon patratus³ Centetodon patratus³ Bown and Schankler 1982 placental "C. sp. 1/2"
Soricomorpha - Nyctitheriidae	Plagioctenodon savagei³ Plagioctenodon savagei³ Bown and Schankler 1982 placental "P. sp. 1"
Leptictida - Leptictidae	Didelphodus absarokae, Prodiacodon tauricinerei Didelphodus absarokae Cope 1881 eutherian Prodiacodon tauricinerei Jepsen 1930 eutherian
Tribosphenida - Herpetotheriidae	Peratherium comstocki Peratherium comstocki Cope 1884 marsupial
Tribosphenida - Peradectidae	Mimoperadectes labrus, Peradectes chesteri Mimoperadectes labrus Bown and Rose 1979 marsupial Peradectes chesteri Gazin 1952 marsupial

¹Alroy 2002; ²Bown and Rose 1987; ³Bown and Schankler 1982; ⁴Gingerich 1982; ⁵Gingerich and Deutsch 1989; ⁶O'Leary and Rose 1995