Elk Creek (180 m): Wasatchian, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Leptictidae
Prodiacodon tauricinerei (Jepsen 1930)
Mammalia - Rodentia - Ischyromyidae
Paramys cf. excavatus Loomis 1907
Mammalia - Rodentia - Sciuravidae
cf. Knightomys depressus (Loomis 1907)
Mammalia - Primates - Microsyopidae
Microsyops sp. Leidy 1872
    = Microsyopidae indet. Osborn and Wortman 1892
Alroy 2002
Haplomylus speirianus (Cope 1880)
recombined as Microsyops speirianus
Mammalia - Primates - Notharctidae
Pelycodus sp. Cope 1875
    = Cantius sp. Simons 1962
Alroy 2002
"mckennai/trigonodus"
Mammalia - Primates - Omomyidae
Tetonius homunculus (Cope 1882)
    = Tetonius matthewi n. sp. Bown and Rose 1987
Bown and Rose 1987
USGS D-1224, 1225, UW V-73125, Y-144: type is from a CM locality "surrounded by sites" at about this level
Tetonoides tenuiculus (Jepsen 1930)
    = Teilhardina crassidens n. sp. Bown and Rose 1987
Bown and Rose 1987
from Y-87, Y-215W, Y-377, UW V-73125 (type)
Mammalia
Dormaaliidae indet. Quinet 1964
    = Talpavoides dartoni Bown and Schankler 1982
Bown and Schankler 1982
Mammalia - Perissodactyla - Equidae
Hyracotherium aemulor Gingerich 1991
"H. sp. 2"
    = Arenahippus grangeri Gingerich 1989
Froehlich 2002
recombined as Sifrhippus grangeri
Mammalia - Phenacodontidae
Ectocion osbornianus (Cope 1882)
Phenacodus vortmani (Cope 1880)
Phenacodus intermedius Granger 1915
Mammalia - Diacodexeidae
Diacodexis metsiacus (Cope 1882)
    = Diacodexis sp. Cope 1882
Alroy 2002
Mammalia - Procreodi - Arctocyonidae
Thryptacodon antiquus Matthew and Granger 1915
Mammalia - Creodonta - Hyaenodontidae
Tritemnodon sp. Matthew 1906
"1"
Arfia opisthotoma (Matthew 1901)
    = Arfia sp. Van Valen 1965
Alroy 2002
Mammalia - Viverravidae
Didymictis leptomylus Cope 1880
Viverravus informal acutus/gracilis
"V. acutus/gracilis"
Viverravus sp. Marsh 1872
"2"
Mammalia
Uintacyon massetericus (Cope 1882)
Mammalia - Acreodi - Mesonychidae
Pachyaena ossifraga Cope 1874
Mammalia - Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870
"loomisi/minor"
Mammalia - Macroscelidea - Apheliscidae
Apheliscus sp. Cope 1875
"wapitiensis/insidiosus"
Mammalia - Macroscelidea - Amphilemuridae
Macrocranion nitens (Matthew 1918)
Mammalia - Coryphodontidae
Coryphodon informal sp. 2 (Owen 1845)
original and current combination Lophiodon (Coryphodon)
"2"
Coryphodon informal sp. 1 (Owen 1845)
original and current combination Lophiodon (Coryphodon)
"1"
Mammalia - Esthonychidae
Esthonyx spatularius Cope 1880
Reptilia - Anguidae
cf. Melanosaurus sp. Gilmore 1928
ElShafie 2024
from Y-88
see common names

Geography
Country:United States State/province:Wyoming County:Big Horn
Coordinates: 44.5° North, 108.0° West (view map)
Paleocoordinates:49.2° North, 90.8° West
Basis of coordinate:based on political unit
Time
Period:Paleogene Epoch:Eocene
Stage:Ypresian 10 m.y. bin:Cenozoic 2
*Period:Tertiary
Key time interval:Wasatchian
Age range of interval:55.80000 - 50.30000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Willwood
Local section:ElkCr Local bed:180 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:YPM localities are in Big Horn County, two USGS localities are in Washakie County
note: Y-215W originally placed at 190 m, placed at 180 m by Bown and Rose (1987)
Metadata
Also known as:YPM 87, 88, 98, 101, 144, 215W, 345, 377, 388, 408; USGS D-1224 (=UW V-73125), 1225
Database number:15514
Authorizer:J. Alroy, P. Holroyd, J. Marcot Enterer:J. Alroy, P. Holroyd, J. Marcot
Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2002-06-03 03:27:40
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
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]
1125 T. M. Bown and D. Schankler. 1982. A review of the Proteutheria and Insectivora of the Willwood Formation (Lower Eocene), Bighorn Basin, Wyoming. United States Geological Survey Bulletin 1523:1-79 [J. Alroy/J. Alroy/J. Ju]
87093 S. J. ElShafie. 2024. Body size estimation from isolated fossil bones reveals deep time evolutionary trends in North American lizards. PLoS ONE 19(1:e0296318):1-25 [P. Holroyd/P. Holroyd/P. Holroyd]
53105 D. J. Froehlich. 2002. Quo vadis Eohippus? The systematics and taxonomy of the early Eocene equids (Perissodactyla). Zoological Journal of the Linnean Society 134:141-256 [M. Carrano/M. Carrano/M. Carrano]