Brecht Ranch: Chadronian, Nebraska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Lagomorpha - Leporidae
Palaeolagus haydeni Leidy 1856
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
Mammalia - Perissodactyla - Hyracodontidae
Hyracodon nebraskensis (Leidy 1850)
probably OK because Ostrander also recognizes H. priscidens
Mammalia - Perissodactyla - Equidae
Mesohippus bairdi (Leidy 1850)
also "M. proteulophus"
Mammalia - Camelidae
Poebrotherium eximium Hay 1902
Prothero 1996
"2.5 miles north of Chadron... Brecht Ranch, Morris Ranch - late Chadronian"
Mammalia - Entelodontidae
Archaeotherium mortoni Leidy 1850
Mammalia - Protoceratidae
Pseudoprotoceras longinaris Cook 1934
Mammalia - Agriochoeridae
Agriochoerus antiquus Leidy 1850
Mammalia - Hypertragulidae
Hypertragulus calcaratus (Cope 1873)
Mammalia - Leptomerycidae
Leptomeryx sp. Leidy 1853
large
Leptomeryx evansi Leidy 1853
Mammalia - Merycoidodontidae
Merycoidodon culbertsoni (Leidy 1848)
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)
Otionohyus wardi Schultz and Falkenbach 1968
    = Miniochoerus forsythae Schultz and Falkenbach 1968
Stevens and Stevens 1996
"Otionohyus wardi degrooti": replaces ID of Schultz and Falkenbach 1968 from UNSM Dw-104, Chadron C
Mammalia - Creodonta - Hyaenodontidae
Hyaenodon crucians Leidy 1853
Mammalia - Carnivora - Nimravidae
Dinictis felina Leidy 1854
Mammalia - Carnivora - Amphicyonidae
Daphoenocyon dodgei (Scott 1898)
recombined as Brachyrhynchocyon dodgei
also present at "Rook Ranch (Dw-104)" and Bartlett Ranch West #1: Hunt 1998b
Daphoenictis tedfordi Hunt 1974
mentioned also by Hunt 1974, Hunt 1996
Mammalia - Carnivora - Canidae
Hesperocyon gregarius (Cope 1873)
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
Stratigraphy
Formation:Chadron
Local section:PineR Local bed:1
Local order:bottom to top
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]
28055% 6280D. 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]