Twin Buttes: 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
Mammalia - Rodentia - Ischyromyidae
Ischyromys sp. Leidy 1856
Mammalia - Rodentia - Aplodontidae
Prosciurus vetustus (Matthew 1903)
original and current combination Sciurus (Prosciurus) vetustus
Mammalia - Rodentia - Sciuridae
Protosciurus sp. Black 1963
    = Sciuridae indet. Gray 1821
Alroy 2002
Mammalia - Rodentia - Eomyidae
Eomyidae indet. Winge 1887
Adjidaumo minutus (Cope 1873)
Paradjidaumo trilophus (Cope 1873)
recombined as Adjidaumo trilophus
Adjidaumo minimus (Matthew 1903)
Aulolithomys bounites Black 1965
Yoderimys burkei Black 1965
recombined as Zemiodontomys burkei
Mammalia - Rodentia - Castoridae
Agnotocastor sp. Stirton 1935
Mammalia - Rodentia - Cylindrodontidae
Cylindrodon galbreathi Ostrander 1983
    = Cylindrodon nebraskensis Hough and Alf 1956
Alroy 2002
Pseudocylindrodon neglectus Burke 1935
Mammalia - Lagomorpha - Leporidae
Palaeolagus temnodon Douglass 1902
Mammalia - Soricidae
Domnina gradata Cope 1873
Mammalia - Geolabididae
Centetodon chadronensis Lillegraven et al. 1981
Mammalia - Oligoryctidae
Oligoryctes cameronensis Hough 1956
Mammalia - Micropternodontidae
Micropternodus montrosensis Ostrander 1983
Mammalia - Apternodontidae
Apternodus iliffensis Galbreath 1953
    = Apternodus sp. Matthew 1903
Asher et al. 2002
Mammalia - Chiroptera
Chiroptera indet. Blumenbach 1779
a bat
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
Mammalia - Perissodactyla - Hyracodontidae
Hyracodon doddi n. sp. Tanner and Martin 1976
synonym of Hyracodon nebraskensis
from UNSM Sx-29
Mammalia - Perissodactyla - Equidae
Mesohippus sp. Marsh 1875
    = Equidae indet. Gray 1821
Alroy 2002
Mammalia - Protoceratidae
Pseudoprotoceras longinaris Cook 1934
Mammalia - Leptomerycidae
Leptomeryx sp. Leidy 1853
Mammalia - Carnivora - Canidae
Hesperocyon sp. Scott 1890
Mammalia - Apatemyidae
Sinclairella dakotensis Jepsen 1934
Mammalia
Peratherium fugax (Cope 1873)
corrected as Herpetotherium fugax
Reptilia
Peltosaurus sp. Cope 1873
Reptilia - Anguidae
Glyptosaurus sp. Marsh 1871
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:37.20000 - 33.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Chadron Member:Big Cottonwood Creek
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:apparently includes UNSM Sx-29
NE 1/4 sec 36 T33N R53W
"Cylindrodon fontis" is probably misidentified, see discussion of this species by Emry and Korth 1996a
Metadata
Database number:17033
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2005-05-19 12:54:52
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]
3369 L. G. Tanner and L. D. Martin. 1976. New Rhinocerotoids from the Oligocene of Nebraska. ATHLON: Essays on Palaeontology in Honour of Loris Shano Russell 210-219 [J. Alroy/J. Alroy/J. Marcot]