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. University of Michigan Papers on Paleontology 24 [J. Alroy/J. Alroy]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
Mammalia
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
"2"
Coryphodon sp. Owen 1845 pantodont
"1"
 Cimolesta - Pantolestidae
Palaeosinopa veterrima Matthew 1901 eutherian
Palaeosinopa lutreola Matthew 1918 eutherian
Palaeosinopa incerta3 Bown and Schankler 1982 eutherian
"P. sp. 1"
 Leptictida - Leptictidae
Prodiacodon tauricinerei Jepsen 1930 eutherian
 Primates - Microsyopidae
Microsyopidae indet.1 Osborn and Wortman 1892 primate
Niptomomys doreenae McKenna 1960 primate
 Primates - Omomyidae
Tetonius matthewi2 Bown and Rose 1987 tarsier
Teilhardina sp.2 Simpson 1940 tarsier
 Primates - Notharctidae
Cantius sp.1 Simons 1962 primate
 Primates - Paromomyidae
Phenacolemurinae indet.1 Simpson 1955 primate
Phenacolemur simonsi Bown and Rose 1976 primate
Ignacius graybullianus Bown and Rose 1976 primate
 Primates - Micromomyidae
Tinimomys graybulliensis Szalay 1974 primate
 Dermoptera -
Plagiomene multicuspis Matthew 1918 colugo
 Rodentia - Sciuravidae
Sciuravidae indet. Miller and Gidley 1918 rodent
"1"
cf. Knightomys depressus Loomis 1907 rodent
cf. Knightomys minor1 Wood 1965 rodent
 Rodentia - Ischyromyidae
Paramys cf. excavatus Loomis 1907 rodent
Paramys cf. copei Loomis 1907 rodent
 Rodentia - Paramyidae
Franimys amherstensis Wood 1962 rodent
 Lipotyphla - Geolabididae
Centetodon patratus3 Bown and Schankler 1982 placental
"C. sp. 1/2"
 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"
 Tribosphenida - Nyctitheriidae
Plagioctenodon savagei3 Bown and Schankler 1982 placental
"P. sp. 1"
 Tribosphenida -
Talpavoides dartoni3 Bown and Schankler 1982 placental
YPM 104; "Dormaaliidae indet."
 Creodonta - Oxyaenidae
Palaeonictis occidentalis Osborn 1892 creodont
Oxyaena sp. Cope 1874 creodont
"intermedia/forcipata"
Oxyaena gulo Matthew and Granger 1915 creodont
 Ferae - Viverravidae
Didymictis leptomylus Cope 1880 placental
Viverravus sp. Marsh 1872 placental
"V. acutus/gracilis"
Viverravus sp. Marsh 1872 placental
"2"
Viverravus sp. Marsh 1872 placental
"3"
 Ferae -
Uintacyon massetericus Cope 1882 placental
 Ferae - Metacheiromyidae
Palaeanodon sp. Matthew 1918 placental
"1"
Palaeanodon ignavus Matthew 1918 placental
 Macroscelidea - Apheliscidae
Haplomylus speirianus Cope 1880 elephant shrew
Apheliscus sp. Cope 1875 elephant shrew
"wapitiensis/insidiosus"
 Macroscelidea - Amphilemuridae
Macrocranion nitens Matthew 1918 elephant shrew
 Tillodontia - Esthonychidae
Esthonyx spatularius Cope 1880 tillodont
 Tillodontia -
"Esthonyx grangeri" = Azygonyx grangeri
"Esthonyx grangeri" = Azygonyx grangeri Simpson 1937 tillodont
 Tribosphenida - Arctocyonidae
Thryptacodon antiquus Matthew and Granger 1915 condylarth
 Ungulata - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
 Ungulata - Diacodexeidae
Diacodexis sp.1 Cope 1882 even-toed ungulate
 Ungulata - Phenacodontidae
Ectocion osbornianus Cope 1882 condylarth
Copecion brachypternus1 Cope 1882 condylarth
Phenacodus intermedius Granger 1915 condylarth
Phenacodus vortmani Cope 1880 condylarth
 Insectivora - Apatemyidae
Labidolemur kayi4 Simpson 1929 insectivoran
"Apatemys DUPLICATE REF 1645 or 1646 or 1647 or 1648 or 1649
 Acreodi - Mesonychidae
Pachyaena gracilis6 Matthew and Granger 1915 condylarth
USGS D-1640, 140 m level
Pachyaena ossifraga Cope 1874 condylarth
 Hyaenodonta -
Prolimnocyon atavus Matthew and Granger 1915 eutherian
 Hyaenodonta - Hyaenodontidae
Prototomus sp. Cope 1874 eutherian
"1"
Arfia shoshoniensis5 Matthew and Granger 1915 eutherian
 Hyaenodonta -
Didelphodus absarokae Cope 1881 eutherian
 Theriiformes - Peradectidae
Mimoperadectes labrus Bown and Rose 1979 metatherian
Peradectes chesteri Gazin 1952 metatherian
 Theriiformes - Herpetotheriidae
Peratherium comstocki Cope 1884 marsupial