Brecht Ranch: Chadronian, Nebraska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Lagomorpha
- Leporidae
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Palaeolagus haydeni
Leidy 1856
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Mammalia
- Perissodactyla
- Brontotheriidae
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Brontotheriidae indet.
(Marsh 1873)
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Mammalia
- Perissodactyla
- Hyracodontidae
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Hyracodon nebraskensis
(Leidy 1850)
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probably OK because Ostrander also recognizes H. priscidens | ||||||||||
Mammalia
- Perissodactyla
- Equidae
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Mesohippus bairdi
(Leidy 1850)
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also "M. proteulophus" | ||||||||||
Mammalia
- Camelidae
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Poebrotherium eximium
Hay 1902
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Prothero 1996 | |||||||||
"2.5 miles north of Chadron... Brecht Ranch, Morris Ranch - late Chadronian" | ||||||||||
Mammalia
- Entelodontidae
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Archaeotherium mortoni
Leidy 1850
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Mammalia
- Protoceratidae
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Pseudoprotoceras longinaris
Cook 1934
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Mammalia
- Agriochoeridae
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Agriochoerus antiquus
Leidy 1850
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Mammalia
- Hypertragulidae
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Hypertragulus calcaratus
(Cope 1873)
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Mammalia
- Leptomerycidae
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Leptomeryx sp.
Leidy 1853
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large | ||||||||||
Leptomeryx evansi
Leidy 1853
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Mammalia
- Merycoidodontidae
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Merycoidodon culbertsoni
(Leidy 1848)
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original and current combination Merycoidodon culbertsonii | ||||||||||
includes "M. culbertsonii browni" and "M. culbertsoni osborni" of Schultz and Falkenbach 1968 from UNSM Dw-104, Chadron C | ||||||||||
Miniochoerus gracilis
(Leidy 1851)
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Otionohyus wardi
Schultz and Falkenbach 1968
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= Miniochoerus forsythae
Schultz and Falkenbach 1968
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Stevens and Stevens 1996 | |||||||||
"Otionohyus wardi degrooti": replaces ID of Schultz and Falkenbach 1968 from UNSM Dw-104, Chadron C | ||||||||||
Mammalia
- Creodonta
- Hyaenodontidae
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Hyaenodon crucians
Leidy 1853
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Mammalia
- Carnivora
- Nimravidae
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Dinictis felina
Leidy 1854
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Mammalia
- Carnivora
- Amphicyonidae
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Daphoenocyon dodgei
(Scott 1898)
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recombined as Brachyrhynchocyon dodgei | ||||||||||
also present at "Rook Ranch (Dw-104)" and Bartlett Ranch West #1: Hunt 1998b | ||||||||||
Daphoenictis tedfordi
Hunt 1974
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mentioned also by Hunt 1974, Hunt 1996 | ||||||||||
Mammalia
- Carnivora
- Canidae
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Hesperocyon gregarius
(Cope 1873)
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specimen from KU-NE-083 "Chadronian" of Walter Brecht Ranch listed by Wang 1994 | ||||||||||
see common names |
Geography
Country: | United States | State/province: | Nebraska | County: | Dawes |
Coordinates: | 42.8° North, 103.1° West (view map) | ||||
Paleocoordinates: | 44.1° North, 94.3° West | ||||
Basis of coordinate: | based on political unit | ||||
Geographic resolution: | small collection |
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 |
Lithology and environment
Environment: | terrestrial indet. |
Taphonomy
Modes of preservation: | body |
Collection methods and comments
Collection size: | 67 specimens |
Taxonomic list comments:includes CSC-55 Bartlett West #1 CSC-92 Rook Ranch lower levels (= UNSM Dw-104: Hunt 1998b) CSC-99 White's south end CSC-26 Hawthorne A CSC-27 Hawthorne B CSC-5 (in part) Schommer Ranch lower level apparently in the Trunk Butter Member sensu LaGarry and LaGarry 1999 Brecht Ranch, level indeterminate: Paratylopus labiatus Prothero 1996d: presumably Orellan; also at "Morris Ranch" possibly relevant: Parictis sp. Hunt 1998a: "Chadron Formation, sect. 2, T32N, R52W, Dawes County" NISP 67, excluding brontotheres |
Metadata
Also known as: | TNAS | ||
Database number: | 16918 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy | Research group: | vertebrate |
Created: | 1993-02-18 00:00:00 | Last modified: | 2002-06-03 03:27:41 |
Access level: | the public | Released: | 1993-02-18 00:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
1757. | E. P. Gustafson. 1986. Preliminary biostratigraphy of the White River Group (Oligocene, Chadron and Brule formations) in the vicinity of Chadron, Nebraska. Transactions of the Nebraska Academy of Sciences 14:7-20 [J. Alroy/J. Alroy/M. Uhen] |
Secondary references:
6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
2805 | 5% 6280 | D. R. Prothero. 1996. Camelidae. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 609-651 [J. Alroy/J. Alroy/J. Marcot] |
6270 | M. S. Stevens and J. B. Stevens. 1996. Merycoidodontinae and Miniochoerinae. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 498-573 [J. Alroy/J. Alroy/J. Alroy] |