Washakie B (Lower) (Eocene of the United States)

Where: Sweetwater County, Wyoming (41.7° N, 109.0° W: paleocoordinates 44.4° N, 97.7° W)

• coordinate based on political unit

When: Adobe Town, middle unit Member (Washakie Formation), Uintan (46.2 - 39.7 Ma)

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: S. M. McCarroll, J. J. Flynn, and W. D. Turnbull. 1996. Biostratigraphy and magnetostratigraphy of the Bridgerian-Uintan Washakie Formation, Washakie Basin, Wyoming. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 25-39 [J. Alroy/J. Alroy/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 16648: authorized by John Alroy, entered by John Alroy on 26.07.1994, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• this unit spans beds 620 to 675 of Roehler; most of the fauna appears to be from the lower half, which is entirely in a normal polarity interval
replaces list of Turnbull 1972
 Dinocerata - Uintatheriidae
Eobasileus cornutus Cope 1872 uintathere
 Acreodi - Mesonychidae
Harpagolestes sp. Wortman 1901 condylarth
 Creodonta -
Limnocyon potens n. sp.3 Matthew 1909 creodont
 Perissodactyla -
Rhinocerotoidea indet.1 Gray 1821 odd-toed ungulate
 Perissodactyla - Hyracodontidae
Triplopus cubitalis n. sp.2 Cope 1880 odd-toed ungulate
is probably from this level see Radinsky 1967a; also at bed 630: McCarroll et al. 1996a
Triplopus implicatus n. sp. Cope 1873 odd-toed ungulate
as well as type of "Eotrigonias petersoni": see Radinsky 1967a
 Perissodactyla - Rhinocerotidae
Uintaceras radinskyi4 Holbrook and Lucas 1997 rhinoceros
UCMP V-78102, V-5426, implicitly at this level; "Forstercooperia grandis"
 Perissodactyla - Amynodontidae
Amynodon advenus Marsh 1875 odd-toed ungulate
"approximately bed 630"; presumably includes type of "Orthocynodon antiquus"; see Wilson and Schiebout 1981
 Perissodactyla - Hyrachyidae
Hyrachyus eximius Leidy 1871 odd-toed ungulate
 Perissodactyla - Tapiridae
Dilophodon minusculus Scott 1883 tapir
if this includes the type, then the type of Chasmotherium intermedius may also be from this horizon: see Radinsky 1963; new material is from "approximately bed 630": McCarroll et al. 1996a
 Perissodactyla - Chalicotheriidae
Eomoropus amarorum Cope 1881 chalicothere
includes type, see Radinsky 1964
 Perissodactyla - Brontotheriidae
Sphenocoelus uintensis5, "Dolichorhinus hyognathus n. sp." = Sphenocoelus hyognathus5, Metarhinus sp.
Sphenocoelus uintensis5 Osborn 1895 brontothere
"Dolichorhinus hyognathus n. sp." = Sphenocoelus hyognathus5 Osborn 1889 brontothere
listed as "D. hyognathus" by Roehler 1973
Metarhinus sp. Osborn 1908 brontothere
presumably "M. earlei" type of Osborn 1908 from "North side of Haystack Mountain... Washakie B" (also listed by Roehler 1973); includes large bone bed sample from bed 643
 Artiodactyla - Helohyidae
Achaenodon insolens n. sp. Cope 1873 even-toed ungulate
see Gazin 1955
Achaenodon robustus n. sp. Osborn 1883 even-toed ungulate
see Gazin 1955
 Artiodactyla - Homacodontidae
? Pentacemylus sp. Peterson 1932 even-toed ungulate
 Artiodactyla - Camelidae
Poebrodon sp. Gazin 1955 camel
assignment questioned by Walsh pers. comm.
 Artiodactyla - Oromerycidae
Protylopus petersoni Wortman 1898 even-toed ungulate
 Primates - Notharctidae
Notharctus robustior Leidy 1872 primate
 Rodentia - Protoptychidae
Protoptychus hatcheri Scott 1895 rodent
includes type of "P. smithi" of Wilson 1937c; see Turnbull 1991
 Rodentia - Ischyromyidae
"Leptotomus leptodus" = Paramys leptodus
"Leptotomus leptodus" = Paramys leptodus Cope 1873 rodent
listed by Black and Sutton 1984 as "L. leptos" - surely a lapsus; "L. grangeri" also listed despite synonymy of Wood 1962
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
listed as "H. cf. paulus" by Turnbull