MP-23 (Eocene of the United States)

Where: Park County, Wyoming (44.6° N, 108.9° W: paleocoordinates 49.3° N, 92.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Willwood Formation, Early/Lower Eocene (55.8 - 48.6 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; lithified siliciclastic sediments

Size classes: macrofossils, mesofossils

Reposited in the UMMP

Collection methods: surface (float), surface (in situ),

Primary reference: P. D. Gingerich and H. A. Deutsch. 1989. Systematics and Evolution of Early Eocene Hyaenodontidae (Mammalia, Creodonta) in the Clarks Fork Basin, Wyoming. Contributions from the Museum of Paleontology, University of Michigan 27(13):327-391 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 15683: authorized by John Alroy, entered by John Alroy on 27.09.1993, edited by Leah Gannon and Will Clyde

Creative Commons license: CC BY (attribution)

Taxonomic list

• may be in Big Horn County, Wa-3
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp.1 Agassiz 1843 gar
 Salientia -
 Testudines -
Testudines indet.1 Batsch 1788 turtle
 Crocodylia - Alligatoridae
Allognathosuchus sp.1 Mook 1921 crocodilian
 Squamata -
 Primates - Microsyopidae
Arctodontomys wilsoni1 Szalay 1969 primate
 Primates - Paromomyidae
Phenacolemur sp.1 Matthew 1915 primate
 Primates - Notharctidae
Cantius mckennai1 Gingerich and Simons 1977 primate
 Cimolesta - Coryphodontidae
Coryphodon eocaenus1 Owen 1846 pantodont
 Glires -
 Rodentia - Ischyromyidae
Paramys copei1 Loomis 1907 rodent
 Perissodactyla -
Homogalax protapirinus1 Wortman 1896 odd-toed ungulate
Cardiolophus radinskyi1 Gingerich 1991 odd-toed ungulate
 Perissodactyla - Equidae
"Hyracotherium aemulor" = Arenahippus aemulor1
"Hyracotherium aemulor" = Arenahippus aemulor1 Gingerich 1991 horse
 Creodonta - Oxyaenidae
Oxyaena gulo2 Matthew and Granger 1915 creodont
Oxyaena intermedia1 Denison 1938 creodont
 Ferae - Viverravidae
Didymictis protenus3 Cope 1874 placental
Viverravus browni1 placental
Viverravus acutus3 Matthew and Granger 1915 placental
 Ferae -
Vassacyon promicrodon1 Wortman and Matthew 1899 placental
 Carnivora - Miacidae
Miacis deutschi1 Gingerich 1983 carnivoran
 Ferae - Metacheiromyidae
Palaeanodon ignavus1 Matthew 1918 placental
 Macroscelidea - Apheliscidae
Haplomylus speirianus1 Cope 1880 elephant shrew
 Trogontia - Esthonychidae
Esthonyx bisulcatus1 Cope 1874 tillodont
 Tribosphenida - Arctocyonidae
Thryptacodon antiquus1 Matthew and Granger 1915 condylarth
 Ungulata - Hyopsodontidae
Hyopsodus loomisi1 McKenna 1960 condylarth
 Ungulata - Diacodexeidae
Diacodexis metsiacus1 Cope 1882 even-toed ungulate
 Ungulata - Phenacodontidae
Ectocion osbornianus1 Cope 1882 condylarth
Phenacodus intermedius1 Granger 1915 condylarth
Phenacodus vortmani1 Cope 1880 condylarth
 Insectivora -
Insectivora indet.1 Bowdich 1821 insectivoran
 Acreodi -
Wyolestes apheles1 Gingerich 1981 mesonychian
 Hyaenodonta - Hyaenodontidae
Prototomus martis Gingerich and Deutsch 1989 eutherian
Arfia shoshoniensis Matthew and Granger 1915 eutherian