FG-18 (Eocene of the United States)

Where: Big Horn County, Wyoming (44.6° N, 108.5° W: paleocoordinates 49.4° N, 91.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Willwood Formation, Wasatchian (55.8 - 50.3 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: D. W. Krause. 1982. Multituberculates from the Wasatchian Land-Mammal Age, Early Eocene, of Western North America. Journal of Paleontology 56(2):271-294 [J. Alroy/J. Alroy/J. Ju]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 15586: authorized by John Alroy, entered by John Alroy on 27.09.1993, edited by Leah Gannon

Creative Commons license: CC BY (attribution)

Taxonomic list

• Zone Wa-2
unclassified
  -
Reptilia
 Crocodylia - Alligatoridae
Allognathosuchus sp.1 Mook 1921 crocodilian
Ceratosuchus ? sp.1 Schmidt 1938 crocodilian
 Squamata - Anguidae
Paraglyptosaurus sp.1 Sullivan 1979 squamates
Mammalia
 Theriamorpha - Leptictidae
Palaeictops bicuspis1 Cope 1880 eutherian
Prodiacodon tauricinerei1 Jepsen 1930 eutherian
 Cimolesta - Apatemyidae
Labidolemur kayi1 Simpson 1929 eutherian
 Cimolesta - Esthonychidae
Esthonyx spatularius1 Cope 1880 tillodont
 Cimolesta - Pantolestidae
Palaeosinopa lutreola1 Matthew 1918 eutherian
 Cimolesta - Coryphodontidae
Coryphodon eocaenus1 Owen 1846 pantodont
 Macroscelidea - Apheliscidae
Apheliscus wapitiensis1 Van Valen 1967 elephant shrew
Apheliscus chydaeus1 Gingerich 1994 elephant shrew
 Condylarthra - Hyopsodontidae
Hyopsodus loomisi1 McKenna 1960 condylarth
 Creodonta - Hyaenodontidae
Arfia shoshoniensis1 Matthew and Granger 1915 creodont
Prototomus martis1 Gingerich and Deutsch 1989 creodont
 Theriamorpha - Viverravidae
Viverravus rosei3 Polly 1997 placental
Viverravus acutus3 Matthew and Granger 1915 placental
 Theriamorpha -
Uintacyon rudis1 Rose 1981 placental
Miacis exiguus1 Matthew and Granger 1915 placental
 Acreodi -
? Wyolestes apheles1 Gingerich 1981 mesonychian
 Theriamorpha - Phenacodontidae
? Phenacodus sp.1 Cope 1873 condylarth
Ectocion osbornianus1 Cope 1882 condylarth
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri1
"Hyracotherium grangeri" = Sifrhippus grangeri1 Gingerich 1989 horse
 Perissodactyla -
Cardiolophus radinskyi1 Gingerich 1991 odd-toed ungulate
 Artiodactyla - Diacodexeidae
Diacodexis metsiacus1 Cope 1882 even-toed ungulate
 Procreodi - Arctocyonidae
Thryptacodon antiquus1 Matthew and Granger 1915 condylarth
 Theriamorpha - Nyctitheriidae
? Leptacodon sp.1 Matthew and Granger 1921 placental
 Rodentia - Ischyromyidae
Acritoparamys atavus1 Jepsen 1937 rodent
Acritoparamys atwateri1 Loomis 1907 rodent
Paramys sp.1 Leidy 1871 rodent
 Primates - Micromomyidae
"Tinimomys graybullensis" = Tinimomys graybulliensis1
"Tinimomys graybullensis" = Tinimomys graybulliensis1 Szalay 1974 primate
 Primates - Paromomyidae
Phenacolemur praecox1 Matthew 1915 primate
Phenacolemur simonsi1 Bown and Rose 1976 primate
Ignacius graybullianus1 Bown and Rose 1976 primate
 Primates - Omomyidae
Teilhardina americana1 Bown 1976 tarsier
 Primates - Microsyopidae
"Haplomylus speirianus" = Microsyops speirianus1 Cope 1880 primate
Arctodontomys wilsoni2 Szalay 1969 primate
Niptomomys sp.1 McKenna 1960 primate
Niptomomys doreenae1 McKenna 1960 primate
 Primates - Notharctidae
Cantius mckennai1 Gingerich and Simons 1977 primate
 Theriamorpha - Peradectidae
Peradectes chesteri1 Gazin 1952 marsupial
 Multituberculata - Neoplagiaulacidae
Parectypodus lunatus Krause 1982 multituberculate
 Multituberculata - Eucosmodontidae
"Neoliotomus ultimus" = Eucosmodon ultimus
"Neoliotomus ultimus" = Eucosmodon ultimus Granger and Simpson 1928 multituberculate