Douglas Area Basal Brule: Chadronian, Wyoming

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Leptictidae
Leptictis dakotensis (Leidy 1868)
Mammalia - Rodentia - Eomyidae
Yoderimys sp. Wood 1955
    = Yoderimyinae indet. Wood 1955
Alroy 2002
Yoderimys bumpi n. gen., n. sp. Wood 1955
Wood 1955
Mammalia - Rodentia - Ischyromyidae
Ischyromys parvidens Miller and Gidley 1920
    = Ischyromys sp. Leidy 1856
Alroy 2002
also listed by Heaton 1993 from Orellan of "Douglas WY"
Mammalia - Lagomorpha - Leporidae
Palaeolagus intermedius Matthew 1899
Palaeolagus haydeni Leidy 1856
Megalagus turgidus (Cope 1873)
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
Mammalia - Carnivora - Canidae
Hesperocyon gregarius (Cope 1873)
Wang 1994
various localities 15, 20, and 25 ft above PWL and 35 ft below "Black Ash" = tuff 6a (?)
Mammalia - Ungulata - Merycoidodontidae
Miniochoerus chadronensis (Schultz and Falkenbach 1956)
Parastenopsochoerus conversensis n. sp. Schultz and Falkenbach 1956
Schultz and Falkenbach 1956
synonym of Miniochoerus chadronensis
Stenopsochoerus (Pseudostenopsochoerus) douglasensis n. sp. Schultz and Falkenbach 1956
Schultz and Falkenbach 1956
synonym of Miniochoerus chadronensis
Merycoidodon culbertsoni (Leidy 1848)
recombined as Merycoidodon (Merycoidodon) culbertsoni
Mammalia - Ungulata - Camelidae
Poebrotherium wilsoni Leidy 1847
Poebrotherium eximium Hay 1902
see also Prothero 1996d
Mammalia - Ungulata - Protoceratidae
Leptotragulus sp. Scott and Osborn 1887
    = Protoceratidae indet. Marsh 1891
Alroy 2002
Mammalia - Ungulata - Leptomerycidae
Leptomeryx speciosus Lambe 1908
Mammalia - Hyaenodonta - Hyaenodontidae
Hyaenodon horridus Leidy 1853
Hyaenodon crucians Leidy 1853
see common names

Country:United States State/province:Wyoming County:Converse
Coordinates: 42.9° North, 105.2° West (view map)
Paleocoordinates:44.4° North, 96.5° West
Basis of coordinate:based on political unit
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
Key time interval:Chadronian
Age range of interval:37.20000 - 33.90000 m.y. ago
* legacy (obsolete) database fields
Formation:Brule Member:basal
Local section:WRGWY Local bed:9
Local order:bottom to top
Lithology and environment
Environment:terrestrial indet.
Modes of preservation:body
Collection methods and comments
Taxonomic list comments: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
Database number:16943
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Research group:vertebrate
Created:1994-04-30 00:00:00 Last modified:2002-06-03 03:27:41
Access level:the public Released:1994-04-30 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

1470. E. Evanoff et al. 1992. [J. Alroy/J. Alroy]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Uhen]
3068 C. B. Schultz and C. H. Falkenbach. 1956. Miniochoerinae and Oreonetinae two new subfamilies of oreodonts. Bulletin of the American Museum of Natural History 109(4):373-482 [J. Alroy/J. Alroy/J. Marcot]
6226 X. Wang. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 221:1-207 [J. Alroy/J. Alroy/J. Alroy]
3729 A. E. Wood. 1955. Rodents from the lower Oligocene Yoder Formation of Wyoming. Journal of Paleontology 29(3):519-524 [J. Alroy/J. Alroy/M. Carrano]