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 - 40.4 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
Mammalia
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
listed as "H. cf. paulus" by Turnbull
 Creodonta -
Limnocyon potens n. sp.3 Matthew 1909 creodont
 Acreodi - Mesonychidae
Harpagolestes sp. Wortman 1901 condylarth
 Perissodactyla - Chalicotheriidae
Eomoropus amarorum Cope 1881 chalicothere
includes type, see Radinsky 1964
 Perissodactyla -
Rhinocerotoidea indet.1 Gray 1821 odd-toed ungulate
 Perissodactyla - Amynodontidae
Amynodon advenus Marsh 1875 odd-toed ungulate
"approximately bed 630"; presumably includes type of "Orthocynodon antiquus"; see Wilson and Schiebout 1981
 Perissodactyla - Rhinocerotidae
Uintaceras radinskyi4 Holbrook and Lucas 1997 rhinoceros
UCMP V-78102, V-5426, implicitly at this level; "Forstercooperia grandis"
 Perissodactyla - Hyrachyidae
Hyrachyus eximius Leidy 1871 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 - 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 - Brontotheriidae
Metarhinus sp., Sphenocoelus uintensis5, "Dolichorhinus hyognathus n. sp." = Sphenocoelus hyognathus5
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
Sphenocoelus uintensis5 Osborn 1895 brontothere
"Dolichorhinus hyognathus n. sp." = Sphenocoelus hyognathus5 Osborn 1889 brontothere
listed as "D. hyognathus" by Roehler 1973
 Artiodactyla - Oromerycidae
Protylopus petersoni Wortman 1898 even-toed ungulate
 Artiodactyla - Camelidae
Poebrodon sp. Gazin 1955 camel
assignment questioned by Walsh pers. comm.
 Artiodactyla - Helohyidae
Achaenodon robustus n. sp. Osborn 1883 even-toed ungulate
see Gazin 1955
Achaenodon insolens n. sp. Cope 1873 even-toed ungulate
see Gazin 1955
 Artiodactyla - Homacodontidae
? Pentacemylus sp. Peterson 1932 even-toed ungulate
 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
 Rodentia - Protoptychidae
Protoptychus hatcheri Scott 1895 rodent
includes type of "P. smithi" of Wilson 1937c; see Turnbull 1991
 Primates - Notharctidae
Notharctus robustior Leidy 1872 primate
 Dinocerata - Uintatheriidae
Eobasileus cornutus Cope 1872 uintathere