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 - Chiroptera - Vespertilionidae
Chadronycteris rabenae Ostrander 1983
a bat
Mammalia - Carnivora - Amphicyonidae
Daphoenus sp. Leidy 1853
    = Amphicyonidae indet. Haeckel 1886
Alroy 2002
could be Brachyrhynchocyon
Mammalia - Carnivora - Canidae
Hesperocyon sp. Scott 1890
Mammalia - Perissodactyla - Equidae
Mesohippus sp. Marsh 1875
    = Equidae indet. Gray 1821
Alroy 2002
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
Mammalia - Protoceratidae
Pseudoprotoceras longinaris Cook 1934
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
Mammalia - Hypisodontidae
Hypisodus minimus (Cope 1873)
Mammalia - Praetragulidae
? Parvitragulus sp. Emry 1978
Mammalia - Leptomerycidae
Leptomeryx sp. Leidy 1853
Mammalia - Soricidae
Domnina gradata Cope 1873
Mammalia - Oligoryctidae
Oligoryctes cameronensis Hough 1956
Mammalia - Micropternodontidae
Micropternodus borealis Matthew 1903
Mammalia - Lagomorpha - Leporidae
Megalagus brachyodon (Matthew 1903)
Palaeolagus temnodon Douglass 1902
Mammalia - Rodentia - Aplodontidae
Prosciurus vetustus (Matthew 1903)
original and current combination Sciurus (Prosciurus) vetustus
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 - Heliscomyidae
Heliscomys vetus Cope 1873
Mammalia - Rodentia - Eomyidae
Eomyidae indet. Winge 1887
Aulolithomys bounites Black 1965
Paradjidaumo trilophus (Cope 1873)
recombined as Adjidaumo trilophus
Adjidaumo minutus (Cope 1873)
Adjidaumo minimus (Matthew 1903)
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]