Douglas Area Basal Brule (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: basal Member (Brule 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 16943: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• just below to c. 7 meters above tuff 5; Wang 1994 gives this "last titanothere" level as 25 ft, and tuff 5 is clearly his "White Marker" (a.k.a. "White Tuff" of Larson and Evanoff 1998)
dated at 33.91 +/- 0.1 Ma SCLF AA on biotite
Mammalia
 Leptictida - Leptictidae
Leptictis dakotensis Leidy 1868 eutherian
 Rodentia - Eomyidae
Yoderimyinae indet.1 Wood 1955 rodent
Yoderimys bumpi n. gen. n. sp.4 Wood 1955 rodent
 Rodentia - Ischyromyidae
Ischyromys sp.1 Leidy 1856 rodent
 Lagomorpha - Leporidae
Palaeolagus intermedius Matthew 1899 rabbit
Palaeolagus haydeni Leidy 1856 rabbit
Megalagus turgidus Cope 1873 rabbit
 Perissodactyla - Brontotheriidae
Brontotheriidae indet. Marsh 1873 brontothere
 Carnivora - Canidae
Hesperocyon gregarius3 Cope 1873 canid
various localities 15, 20, and 25 ft above PWL and 35 ft below "Black Ash" = tuff 6a (?)
 Ungulata - Merycoidodontidae
"Miniochoerus chadronensis" = Miniochoerus chadronensis, "Parastenopsochoerus conversensis n. sp." = Miniochoerus chadronensis2, "Stenopsochoerus (Pseudostenopsochoerus) douglasensis n. sp." = Miniochoerus chadronensis2, "Merycoidodon culbertsoni" = Merycoidodon (Merycoidodon) culbertsoni
"Miniochoerus chadronensis" = Miniochoerus chadronensis Schultz and Falkenbach 1956 oreodont
"Parastenopsochoerus conversensis n. sp." = Miniochoerus chadronensis2 Schultz and Falkenbach 1956 oreodont
"Stenopsochoerus (Pseudostenopsochoerus) douglasensis n. sp." = Miniochoerus chadronensis2 Schultz and Falkenbach 1956 oreodont
"Merycoidodon culbertsoni" = Merycoidodon (Merycoidodon) culbertsoni Leidy 1848 oreodont
 Ungulata - Camelidae
Poebrotherium wilsoni Leidy 1847 camel
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