Diamond O Ranch: Duchesnean - Chadronian, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Insectivora
Insectivora indet. Bowdich 1821
said to be a new genus and species
Mammalia - Rodentia - Cylindrodontidae
Ardynomys occidentalis Burke 1936
Pseudocylindrodon sp. Burke 1935
? Pareumys sp. Peterson 1919
Mammalia - Rodentia - Eutypomyidae
Eutypomys sp. Matthew 1905
Mammalia - Rodentia - Eomyidae
Adjidaumo aff. minimus (Matthew 1903)
Paradjidaumo aff. trilophus (Cope 1873)
recombined as Adjidaumo trilophus
Mammalia - Rodentia - Ischyromyidae
Ischyromys cf. douglassi Black 1968
Mammalia - Lagomorpha - Leporidae
? Megalagus sp. Walker 1931
said to be new
Palaeolagus sp. Leidy 1856
Mammalia - Proscalopidae
Proscalopidae indet. Reed 1961
Mammalia - Apternodontidae
Apternodus cf. mediaevus Matthew 1903
    = Apternodus baladontus Asher et al. 2002
Asher et al. 2002
Mammalia - Oligoryctidae
Oligoryctes cf. cameronensis Hough 1956
Mammalia - Micropternodontidae
Cryptoryctes sp. Reed 1954
Mammalia - Soricidae
Domnina cf. thompsoni Simpson 1941
Mammalia - Geolabididae
Centetodon cf. kuenzii Lillegraven et al. 1981
Mammalia
"Miacis" sp. Cope 1872
said to be new
Mammalia - Carnivora - Canidae
? Hesperocyon sp. Scott 1890
Mammalia - Epoicotheriidae
Epoicotherium sp. Simpson 1927
Mammalia - Creodonta - Hyaenodontidae
Hyaenodon sp. Laizer and Parieu 1838
Mammalia - Leptomerycidae
Hendryomeryx cf. defordi (Wilson 1974)
Mammalia - Agriochoeridae
Protoreodon sp. Scott and Osborn 1887
Mammalia - Perissodactyla - Equidae
Mesohippus sp. Marsh 1875
Mammalia - Perissodactyla - Tapiridae
? Colodon cingulatus Douglass 1902
Mammalia - Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821
Mammalia - Perissodactyla - Hyracodontidae
? Hyracodon sp. Leidy 1856
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
Mammalia - Leptictidae
Leptictis sp. Leidy 1868
    = Leptictidae indet. Gill 1872
Alroy 2002
Mammalia
Herpetotherium valens (Lambe 1908)
described by Korth 1994a
Copedelphys cf. titanelix (Matthew 1903)
see common names

Geography
Country:United States State/province:Montana County:Beaverhead
Coordinates: 45.0° North, 112.8° West (view map)
Paleocoordinates:47.0° North, 103.7° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period:Paleogene Epoch:Eocene
10 m.y. bin:Cenozoic 3
*Period:Tertiary
Key time interval:Duchesnean - Chadronian
Age range of interval:39.70000 - 33.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Renova Member:Climbing Arrow
Local section:JeffB Local bed:1
Local order:bottom to top
Lithology and environment
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Taxonomic list comments:many of the small mammals are from MV 6726
apparently does not include Burnt Hills, which is in Madison County
said to be "very near the Duchesnean/Chadronian boundary"
Metadata
Also known as:MV 6726, MV 6727, MV 6728, MV 6729, MV 6730
Database number:16840
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:1997-04-12 00:00:00 Last modified:2006-09-13 00:27:33
Access level:the public Released:1997-04-12 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
3359. A. R. Tabrum, D. R. Prothero, and D. Garcia. 1996. Magnetostratigraphy and biostratigraphy of the Eocene-Oligocene transition, southwestern Montana. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 278-311 [J. Alroy/J. Alroy/J. Alroy]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]