Douglas Area Brule (5-6a) (Oligocene of the United States)

Where: Converse County, Wyoming (42.9° N, 105.2° W: paleocoordinates 44.2° N, 97.1° W)

• coordinate based on political unit

When: Brule Formation, Orellan (33.9 - 33.3 Ma)

Environment/lithology: terrestrial

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

PaleoDB collection 17104: authorized by John Alroy, entered by John Alroy on 30.04.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• from c. 7 meters above tuff 5 to tuff 6a - the "Black Marker" of Wang 1994 appears to be tuff 6a
not clear from figure if L. evansi is really in this zone
Mammalia
 Leptictida - Leptictidae
Leptictis dakotensis Leidy 1868 eutherian
 Rodentia - Cricetidae
"Scottimus viduus" = Willeumys viduus
"Scottimus viduus" = Willeumys viduus Korth 1981 mouse
 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
Litolagus molidens Dawson 1958 rabbit
may include type of Dawson 1958 from LNZ 6.5 mi SE of Douglas
 Carnivora - Canidae
Hesperocyon gregarius3 Cope 1873 canid
various localities 30 and 55 ft above PWL and 3 and 30 ft below "Black Ash"
 Carnivora -
Palaeogale sectoria1 Gervais 1848 carnivoran
 Ungulata - Merycoidodontidae
Leptauchenia decora2 Leidy 1856 oreodont
Miniochoerus chadronensis Schultz and Falkenbach 1956 oreodont
"Merycoidodon culbertsoni" = Merycoidodon (Merycoidodon) culbertsoni Leidy 1848 oreodont
 Ungulata - Camelidae
Paratylopus labiatus1 Cope 1881 camel
Poebrotherium wilsoni Leidy 1847 camel
Poebrotherium eximium Hay 1902 camel
see also Prothero 1996d
 Ungulata - Hypertragulidae
Hypertragulus calcaratus Cope 1873 ruminant
 Ungulata - Leptomerycidae
Leptomeryx speciosus Lambe 1908 ruminant
 Hyaenodonta - Hyaenodontidae
Hyaenodon horridus Leidy 1853 eutherian
Hyaenodon crucians Leidy 1853 eutherian