FG-25 (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 15589: 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-1
Reptilia
 Crocodylia - Alligatoridae
Allognathosuchus sp.1 Mook 1921 crocodilian
 Squamata -
 Squamata - Anguidae
Paraglyptosaurus sp.1 Sullivan 1979 squamates
Mammalia
 Multituberculata - Eucosmodontidae
"Neoliotomus ultimus" = Eucosmodon ultimus
"Neoliotomus ultimus" = Eucosmodon ultimus Granger and Simpson 1928 multituberculate
 Theriamorpha - Leptictidae
Palaeictops bicuspis1 Cope 1880 eutherian
 Cimolesta - Coryphodontidae
Coryphodon eocaenus1 Owen 1846 pantodont
 Cimolesta -
Azygonyx sp.1 Gingerich 1989 tillodont
 Cimolesta - Esthonychidae
Esthonyx spatularius1 Cope 1880 tillodont
 Macroscelidea - Apheliscidae
Haplomylus speirianus1 Cope 1880 elephant shrew
 Condylarthra - Hyopsodontidae
Hyopsodus loomisi1 McKenna 1960 condylarth
 Acreodi -
Wyolestes apheles2 Gingerich 1981 mesonychian
DUPLICATE REF 1643 or 1644
 Acreodi - Mesonychidae
Pachyaena gracilis1 Matthew and Granger 1915 condylarth
 Creodonta - Hyaenodontidae
Arfia shoshoniensis3 Matthew and Granger 1915 creodont
Prototomus phobos3 Gingerich and Deutsch 1989 creodont
 Creodonta - Oxyaenidae
Oxyaena gulo1 Matthew and Granger 1915 creodont
 Theriamorpha -
Uintacyon rudis1 Rose 1981 placental
 Theriamorpha - Viverravidae
Viverravus acutus1 Matthew and Granger 1915 placental
Didymictis protenus1 Cope 1874 placental
 Perissodactyla - Equidae
"Hyracotherium grangeri" = Sifrhippus grangeri1
"Hyracotherium grangeri" = Sifrhippus grangeri1 Gingerich 1989 horse
 Theriamorpha - Phenacodontidae
Ectocion osbornianus1 Cope 1882 condylarth
Phenacodus vortmani1 Cope 1880 condylarth
 Artiodactyla - Diacodexeidae
Diacodexis metsiacus1 Cope 1882 even-toed ungulate
 Procreodi - Arctocyonidae
Thryptacodon antiquus1 Matthew and Granger 1915 condylarth
 Rodentia - Ischyromyidae
Paramys sp.1 Leidy 1871 rodent
Paramys pycnus5 Ivy 1990 rodent
Acritoparamys atwateri1 Loomis 1907 rodent
 Primates - Notharctidae
Cantius ralstoni1 Matthew 1915 primate
 Primates - Microsyopidae
Arctodontomys wilsoni4 Szalay 1969 primate