Douglas Area Upper Chadron (Eocene of the United States)

Where: Converse County, Wyoming (42.9° N, 105.2° W: paleocoordinates 44.4° N, 96.5° W)

• coordinate based on political unit

When: Chadron Formation, Chadronian (37.2 - 33.9 Ma)

Environment/lithology: terrestrial

Primary reference: E. Evanoff et al. 1992. [J. Alroy/J. Alroy]more details

PaleoDB collection 16942: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• tuffs 4 and 5 are above, not correlable with, the F:AM "Upper Puprle White": Larson and Evanoff 1998
between tuffs 4 and 5
Mammalia
 Leptictida - Leptictidae
Leptictis dakotensis Leidy 1868 eutherian
 Rodentia - Eomyidae
Yoderimyinae indet.1 Wood 1955 rodent
 Rodentia - Ischyromyidae
Ischyromyidae indet.1 Alston 1876 rodent
Ischyromys veterior1 Matthew 1903 rodent
 Lagomorpha - Leporidae
Palaeolagus haydeni Leidy 1856 rabbit
Megalagus brachyodon Matthew 1903 rabbit
Megalagus turgidus Cope 1873 rabbit
 Perissodactyla - Brontotheriidae
Brontotheriidae indet. Marsh 1873 brontothere
 Perissodactyla - Rhinocerotidae
Subhyracodon mitis2 Cope 1875 rhinoceros
"From the late Chadronian: ... from Douglas, Converse County, Wyoming"
 Ungulata - Merycoidodontidae
Miniochoerus forsythae3 Schultz and Falkenbach 1968 oreodont
Miniochoerus chadronensis Schultz and Falkenbach 1956 oreodont
includes "Stenopsochoerus douglasensis" Schultz and Falkenbach 1956 from Chadron Fm., UNSM Wyo-3 7 mi SE of Douglas
"Merycoidodon culbertsoni" = Merycoidodon (Merycoidodon) culbertsoni Leidy 1848 oreodont
 Ungulata - Camelidae
Poebrotherium eximium Hay 1902 camel
see also Prothero 1996d
 Ungulata - Protoceratidae
Protoceratidae indet.1 Marsh 1891 protoceratid
 Ungulata - Leptomerycidae
Leptomeryx speciosus Lambe 1908 ruminant
 Hyaenodonta - Hyaenodontidae
Hyaenodon horridus Leidy 1853 eutherian
Hyaenodon crucians Leidy 1853 eutherian