Elk Creek (580 m) (Eocene of the United States)

Also known as YPM 21, 25, 39, 55, 71a, 73, 75, 76, 77, 168, USGS D-1474 (575 m), 1337, 1346, 1431, 1435, 1468

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 15554: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• YPM 55 is from Washakie County
Mammalia
 Leptictida - Leptictidae
Palaeictops bicuspis Cope 1880 eutherian
 Primates - Microsyopidae
Microsyopidae indet.1 Osborn and Wortman 1892 primate
 Primates - Omomyidae
Absarokius abbotti Loomis 1906 tarsier
OK, B & R 87: Y-21, 25, 39, 55, 77, 168, USGS D-1337,1346, 1431, 1468, 1474
Absarokius metoecus2 Bown and Rose 1987 tarsier
Y-168
 Primates - Notharctidae
Cantius nunienus1 Cope 1881 primate
Cantius abditus1 Gingerich and Simons 1977 primate
 Primates - Paromomyidae
Phenacolemurinae indet. Simpson 1955 primate
"Phenacolemur sp. 2"
 Rodentia - Sciuravidae
cf. Knightomys depressus Loomis 1907 rodent
 Rodentia - Ischyromyidae
Paramys cf. excavatus Loomis 1907 rodent
Paramys cf. copei Loomis 1907 rodent
cf. Mytonomys coloradensis1 Wood 1962 rodent
 Perissodactyla -
Heptodon calciculus Cope 1880 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri, "Hyracotherium aemulor" = Arenahippus aemulor, "Hyracotherium cf. index" = Minippus index
"Hyracotherium grangeri" = Sifrhippus grangeri Gingerich 1989 horse
"H. sp. 1"
"Hyracotherium aemulor" = Arenahippus aemulor Gingerich 1991 horse
"H. sp. 2"
"Hyracotherium cf. index" = Minippus index Cope 1873 horse
 Creodonta - Oxyaenidae
Ambloctonus sinosus Cope 1875 creodont
Oxyaena sp. Cope 1874 creodont
"intermedia/forcipata"
 Ferae - Viverravidae
Didymictis sp. Cope 1875 placental
"curtidens/lysitensis"
Viverravus sp. Marsh 1872 placental
"V. acutus/gracilis"
 Ferae -
Oodectes sp.1 Wortman 1901 placental
Uintacyon asodes Gazin 1952 placental
 Carnivora - Miacidae
Miacis sp.1 Cope 1872 carnivoran
 Carnivora -
Vulpavus australis Matthew and Granger 1915 carnivoran
Vulpavus canavus Cope 1881 carnivoran
 Tillodontia - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Tribosphenida - Arctocyonidae
Anacodon ursidens Cope 1882 condylarth
Chriacus gallinae Matthew and Granger 1915 condylarth
 Ungulata - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"latidens/miticulus"
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
Hyopsodus powellianus Cope 1884 condylarth
 Ungulata - Diacodexeidae
Bunophorus sp.1 Sinclair 1914 even-toed ungulate
Diacodexis sp.1 Cope 1882 even-toed ungulate
 Ungulata - Phenacodontidae
Copecion brachypternus1 Cope 1882 condylarth
Phenacodus vortmani Cope 1880 condylarth
 Insectivora - Apatemyidae
Labidolemur kayi3 Simpson 1929 insectivoran
"Apatemys chardini/bellulus" DUPLICATE REF 1645 or 1646 or 1647 or 1648 or 1649
 Hyaenodonta - Hyaenodontidae
Prototomus sp. Cope 1874 eutherian
"1"
Tritemnodon strenuus1 Cope 1875 eutherian
 Hyaenodonta -
Didelphodus absarokae Cope 1881 eutherian