Elk Creek (530 m) (Eocene of the United States)

Also known as YPM 126, 227, 227N, 228, 253, USGS D-1157, 1230

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 15548: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• USGS localities are in Washakie County
YPM 45, 45N, 227, and 227N were placed at this level by Schankler, but 45 was placed at 470 m, and 227 at 457 m, by Bown and Rose (1987); see next list for YPM 45
other lists possibly at this level, with Bown levels:
USGS D-1698, 1784 (455 m), 1699 (463 m), 1495 (464 m), 1676 (464 m)
Steinius vespertinus is at USGS D-1699: B & R 87
Mammalia
 Cimolesta - Coryphodontidae
Coryphodon sp. Owen 1845 pantodont
"2"
 Leptictida - Leptictidae
Prodiacodon tauricinerei Jepsen 1930 eutherian
Palaeictops bicuspis Cope 1880 eutherian
 Primates - Microsyopidae
Microsyopidae indet.1 Osborn and Wortman 1892 primate
 Primates - Omomyidae
Omomyidae indet. Gazin 1958 tarsier
"1"
Omomyidae indet.1 Gazin 1958 tarsier
Tetonius sp.1 Matthew 1915 tarsier
Absarokius abbotti2 Loomis 1906 tarsier
Y-227, 228, USGS D-1157, 1230 level questionable: USGS D-1495, 1698, 1699
Absarokius metoecus2 Bown and Rose 1987 tarsier
USGS D-1230 level questionable: USGS D-1495, 1676, 1699
 Primates - Notharctidae
Cantius abditus1 Gingerich and Simons 1977 primate
 Primates - Paromomyidae
Phenacolemurinae indet. Simpson 1955 primate
"Phenacolemur sp. 1" and "P. 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
 Placentalia -
Perissodactyla indet. Owen 1848 odd-toed ungulate
"1"
 Perissodactyla -
Heptodon calciculus Cope 1880 odd-toed ungulate
Cardiolophus semihians5 Cope 1882 odd-toed ungulate
 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"
 Ferae - Viverravidae
Didymictis sp. Cope 1875 placental
"curtidens/lysitensis"
Viverravus sp. Marsh 1872 placental
"V. acutus/gracilis"
 Ferae -
Uintacyon asodes Gazin 1952 placental
Vassacyon promicrodon Wortman and Matthew 1899 placental
 Carnivora - Miacidae
Miacis petilus4 Gingerich 1983 carnivoran
 Carnivora -
Vulpavus australis Matthew and Granger 1915 carnivoran
Vulpavus canavus Cope 1881 carnivoran
 Ferae - Metacheiromyidae
Palaeanodon ignavus Matthew 1918 placental
 Tillodontia - Esthonychidae
Esthonyx bisulcatus Cope 1874 tillodont
 Tribosphenida - Arctocyonidae
Anacodon ursidens Cope 1882 condylarth
Thryptacodon antiquus1 Matthew and Granger 1915 condylarth
 Ungulata - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
"latidens/miticulus"
Hyopsodus sp. Leidy 1870 condylarth
"loomisi/minor"
 Ungulata - Uintatheriidae
Uintatheriidae indet. Flower 1876 uintathere
"1"
 Ungulata - Homacodontidae
cf. Hexacodus sp. Gazin 1952 even-toed ungulate
 Ungulata - Diacodexeidae
Bunophorus grangeri7 Sinclair 1914 even-toed ungulate
Diacodexis sp.1 Cope 1882 even-toed ungulate
 Ungulata - Phenacodontidae
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 -
Prolimnocyon atavus Matthew and Granger 1915 eutherian
confirmed by Gingerich and Deutsch 1989
 Hyaenodonta - Hyaenodontidae
Prototomus secundarius6 Cope 1875 eutherian
"P. sp. 1"
Tritemnodon strenuus1 Cope 1875 eutherian
 Hyaenodonta -
Didelphodus absarokae Cope 1881 eutherian