Dirty Creek Ridge: Chadronian, Nebraska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Leptictis acutidens (Douglass 1902)
    = informal Novacek leptictid acutidens
Alroy 2002
Reptilia
Peltosaurus sp. Cope 1873
Reptilia - Anguidae
Glyptosaurus sp. Marsh 1871
Mammalia - Soricidae
Domnina gradata Cope 1873
Mammalia - Oligoryctidae
Oligoryctes cameronensis Hough 1956
Mammalia - Micropternodontidae
Micropternodus borealis Matthew 1903
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
Mammalia - Perissodactyla - Equidae
Mesohippus sp. Marsh 1875
    = Equidae indet. Gray 1821
Alroy 2002
Mammalia - Protoceratidae
Heteromeryx dispar Matthew 1905
Wilson 1974
FMNH specimen from Henry Morgan Quarry, NE 1/4 sec 23 T33N R53W Sioux Co., i.e., different part of same section as Dirty Creek Ridge
Pseudoprotoceras longinaris Cook 1934
Mammalia - Leptomerycidae
Leptomeryx sp. Leidy 1853
Mammalia - Hypisodontidae
Hypisodus minimus (Cope 1873)
Mammalia - Praetragulidae
? Parvitragulus sp. Emry 1978
Mammalia - Carnivora - Amphicyonidae
Daphoenus sp. Leidy 1853
    = Amphicyonidae indet. Haeckel 1886
Alroy 2002
could be Brachyrhynchocyon
Mammalia - Carnivora - Canidae
Hesperocyon sp. Scott 1890
Mammalia - Rodentia - Sciuridae
Oligospermophilus douglassi (Korth 1981)
Korth 1987
coordinate 1/2 mi N of Dirty Creek Ridge, 59' below top of Chadron (fauna is from 43' below top)
Mammalia - Rodentia - Aplodontidae
Prosciurus vetustus (Matthew 1903)
original and current combination Sciurus (Prosciurus) vetustus
Mammalia - Rodentia - Heliscomyidae
Heliscomys vetus Cope 1873
Mammalia - Rodentia - Eomyidae
Eomyidae indet. Winge 1887
Aulolithomys bounites Black 1965
Adjidaumo minimus (Matthew 1903)
Adjidaumo minutus (Cope 1873)
Paradjidaumo trilophus (Cope 1873)
recombined as Adjidaumo trilophus
Mammalia - Lagomorpha - Leporidae
Megalagus brachyodon (Matthew 1903)
Palaeolagus temnodon Douglass 1902
Mammalia - Chiroptera - Vespertilionidae
Chadronycteris rabenae Ostrander 1983
a bat
Mammalia
Peratherium fugax (Cope 1873)
corrected as Herpetotherium fugax
see common names

Geography
Country:United States State/province:Nebraska County:Sioux
Coordinates: 42.4° North, 103.8° West (view map)
Paleocoordinates:43.8° North, 95.1° West
Basis of coordinate:based on political unit
Time
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
*Period:Tertiary
Key time interval:Chadronian
Age range of interval:37.00000 - 33.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Chadron Member:Peanut Peak
Local section:PineR Local bed:1
Local order:bottom to top
Stratigraphy comments: member assignment based on LaGarry pers. commun. 19 May 2005
Lithology and environment
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Collection methods and comments
Taxonomic list comments:SE 1/4 sec 23 T33N R53W
Metadata
Database number:16941
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2005-05-19 12:55:13
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
2716. G. E. Ostrander. 1985. Correlation of the early Oligocene (Chadronian) in northwestern Nebraska. Dakoterra 2(2):205-231 [J. Alroy/J. Alroy/P. Holroyd]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
2108 W. W. Korth. 1987. Sciurid rodents (Mammalia) from the Chadronian and Orellan (Oligocene) of Nebraska. Journal of Paleontology 61(6):1247-1255 [J. Alroy/J. Alroy/J. Marcot]
3663 J. A. Wilson. 1974. Early Tertiary Vertebrate Faunas, Vieja Group and Buck Hill Group, Trans-Pecos Texas: Protoceratidae, Camelidae, Hypertragulidae. Bulletin of the Texas Memorial Museum 23:1-24 [J. Alroy/J. Alroy/J. Marcot]