Washakie A (Eocene of the United States)

Also known as LaClede Meadows

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

• coordinate based on political unit

When: lower Adobe Town Member (Washakie Formation), Uintan (46.2 - 40.4 Ma)

Environment/lithology: terrestrial

Primary reference: S. M. McCarroll, J. J. Flynn, and W. D. Turnbull. 1996. [J. Alroy/J. Alroy]more details

PaleoDB collection 16647: authorized by John Alroy, entered by John Alroy on 26.07.1994, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

• this unit spans beds 569 to 620 of Roehler; most of this interval is reversed, but there are two normal excursions of unclear significance; it is best treated as a reversed chron immediately preceding the normal chron seen in the overlying unit
Turnbull 1972 distinguished "upper" and "lower" Washakie A faunas but the upper fauna is duplicated almost entirely by the lower fauna and the two are merged by McCarroll et al.; list is still incomplete and certain older i.d.s therefore may be valid
Reptilia
 Testudines - Baenidae
Baena arenosa3 Leidy 1870 turtle
AMNH 1115 (Hay, 1908, figs. 49-5 1), shell, portion of pelvis.
Mammalia
 Cimolesta - Pantolestidae
Pantolestidae indet.1 Cope 1884 eutherian
"Pantolestes cf. longicaudus" = Pantolestes longieundus Cope 1872 eutherian
Pantolestes cf. natans Matthew 1909 eutherian
 Primates - Microsyopidae
Microsyops annectens Marsh 1872 primate
 Primates - Notharctidae
Notharctus robustior Leidy 1872 primate
 Primates - Omomyidae
Omomys carteri Leidy 1869 primate
Hemiacodon gracilis Marsh 1872 primate
 Rodentia - Sciuravidae
Sciuravus sp. Marsh 1871 rodent
Sciuravus nitidus Marsh 1871 rodent
 Rodentia - Ischyromyidae
Paramys sp. Leidy 1871 rodent
listed as "P. delicatus" by Turnbull
Thisbemys sp. Wood 1959 rodent
Leptotomus parvus1 Wood 1959 rodent
 Rodentia - Cylindrodontidae
Mysops parvus Marsh 1872 rodent
 Condylarthra - Hyopsodontidae
Hyopsodus paulus Leidy 1870 condylarth
 Amblypoda - Uintatheriidae
Uintatherium anceps Marsh 1871 uintathere
listed as "Dinoceras cuneum" and "Tinoceras affine" by Turnbull 1972
 Perissodactyla - Brontotheriidae
Mesatirhinus sp. Osborn 1908 brontothere
listed as "M. megarhinus" by Turnbull
Palaeosyops sp. Leidy 1870 brontothere
this is the AMNH "P. copei" specimen of Osborn 1929 from Washakie A; may include "Titanotheriidae indet." of Turnbull 1972
Telmatherium sp. Marsh 1872 brontothere
based on discussion of Mader 1989, I believe this includes the type of "Manteoceras washakiensis" Osborn 1908 from "Base of Haystack Mountain... summit of the Lower Washakie (A)" (said by Roehler 1973 to be upper Washakie A
 Perissodactyla -
Isectolophus latidens Osborn et al. 1878 odd-toed ungulate
 Perissodactyla - Hyrachyidae
Hyrachyus modestus Leidy 1870 odd-toed ungulate
Hyrachyus eximius Leidy 1871 odd-toed ungulate
 Perissodactyla - Equidae
Orohippus sp. Marsh 1872 horse
 Creodonta - Oxyaenidae
Patriofelis ferox2 Marsh 1872 creodont
 Ferae - Viverravidae
Viverravus sp. Marsh 1872 placental
 Carnivora - Miacidae
"Miacis cf. sylvestris" = Harpalodon sylvestris, Miacis medius
"Miacis cf. sylvestris" = Harpalodon sylvestris Marsh 1872 carnivoran
Miacis medius Matthew 1909 carnivoran
 Carnivora - Canidae
"Miacis washakius" = Neovulpavus washakius
"Miacis washakius" = Neovulpavus washakius Wortman 1901 canid
 Taeniodonta - Stylinodontidae
"Stylinodon mirus" = Stylinodon mirus, "Stylinodon inexplicatus n. sp." = Stylinodon mirus
"Stylinodon mirus" = Stylinodon mirus Marsh 1874 taeniodont
"Stylinodon inexplicatus n. sp." = Stylinodon mirus Marsh 1874 taeniodont
and only specimen according to Schoch and Lucas 1981b
 Acreodi - Mesonychidae
Harpagolestes sp. Wortman 1901 condylarth
probably "Synoplotherium sp." of Turnbull 1972
 Hyaenodonta - Hyaenodontidae
Sinopa sp., "Thinocyon velox" = Limnocyon velox1
Sinopa sp. Leidy 1871 eutherian
listed as "S. rapax" by Turnbull
"Thinocyon velox" = Limnocyon velox1 Marsh 1872 eutherian
 Theriiformes - Herpetotheriidae
Herpetotherium cf. knighti1 McGrew et al. 1959 marsupial
 Artiodactyla - Homacodontidae
Homacodon vagans Marsh 1872 even-toed ungulate
 Sarcobora - Apatemyidae
cf. Apatemys bellus Marsh 1872 insectivoran