PBDB Collection

Diamond O Ranch (Eocene to of the United States)

Also known as MV 6726, MV 6727, MV 6728, MV 6729, MV 6730

Where: Beaverhead County, Montana (45.0° N, 112.8° W: paleocoordinates 47.0° N, 103.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Climbing Arrow Member (Renova Formation), Duchesnean to Duchesnean (39.7 - 33.9 Ma)

Environment/lithology: terrestrial

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 16840: authorized by John Alroy, entered by John Alroy on 12.04.1997

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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"

Show authors, comments, and common names

Mammalia
Theriamorpha - Herpetotheriidae	Copedelphys cf. titanelix, Herpetotherium valens Copedelphys cf. titanelix Matthew 1903 marsupial Herpetotherium valens Lambe 1908 marsupial described by Korth 1994a
Theriamorpha - Leptictidae	Leptictidae indet.¹ Leptictidae indet.¹ Gill 1872 eutherian
Insectivora -	Insectivora indet. Insectivora indet. Bowdich 1821 insectivoran said to be a new genus and species
Perissodactyla - Brontotheriidae	Brontotheriidae indet. Brontotheriidae indet. Marsh 1873 brontothere
Perissodactyla - Equidae	Mesohippus sp. Mesohippus sp. Marsh 1875 anchitheriine horse
Perissodactyla - Hyracodontidae	? Hyracodon sp. ? Hyracodon sp. Leidy 1856 odd-toed ungulate
Perissodactyla - Rhinocerotidae	Rhinocerotidae indet. Rhinocerotidae indet. Gray 1821 rhinoceros
Perissodactyla - Tapiridae	? Colodon cingulatus ? Colodon cingulatus Douglass 1902 tapir
Artiodactyla - Leptomerycidae	Hendryomeryx cf. defordi Hendryomeryx cf. defordi Wilson 1974 ruminant
Artiodactyla - Agriochoeridae	Protoreodon sp. Protoreodon sp. Scott and Osborn 1887 agriochoerid
Carnivora - Canidae	? Hesperocyon sp. ? Hesperocyon sp. Scott 1890 canid
Theriamorpha -	"Miacis" sp. "Miacis" sp. Cope 1872 placental said to be new
Theriamorpha - Epoicotheriidae	Epoicotherium sp. Epoicotherium sp. Simpson 1927 placental
Creodonta - Hyaenodontidae	Hyaenodon sp. Hyaenodon sp. Laizer and Parieu 1838 creodont
Theriamorpha - Proscalopidae	Proscalopidae indet. Proscalopidae indet. Reed 1961 placental
Theriamorpha - Geolabididae	Centetodon cf. kuenzii Centetodon cf. kuenzii Lillegraven et al. 1981 placental
Theriamorpha - Oligoryctidae	Oligoryctes cf. cameronensis Oligoryctes cf. cameronensis Hough 1956 placental
Theriamorpha - Apternodontidae	Apternodus baladontus² Apternodus baladontus² Asher et al. 2002 placental
Theriamorpha - Micropternodontidae	Cryptoryctes sp. Cryptoryctes sp. Reed 1954 placental
Theriamorpha - Soricidae	Domnina cf. thompsoni Domnina cf. thompsoni Simpson 1941 shrew
Lagomorpha - Leporidae	? Megalagus sp., Palaeolagus sp. ? Megalagus sp. Walker 1931 rabbit said to be new Palaeolagus sp. Leidy 1856 rabbit
Rodentia - Ischyromyidae	Ischyromys cf. douglassi Ischyromys cf. douglassi Black 1968 rodent
Rodentia - Eomyidae	Adjidaumo aff. minimus, "Paradjidaumo aff. trilophus" = Adjidaumo trilophus Adjidaumo aff. minimus Matthew 1903 rodent "Paradjidaumo aff. trilophus" = Adjidaumo trilophus Cope 1873 rodent
Rodentia - Eutypomyidae	Eutypomys sp. Eutypomys sp. Matthew 1905 rodent
Rodentia - Cylindrodontidae	Pseudocylindrodon sp., ? Pareumys sp., Ardynomys occidentalis Pseudocylindrodon sp. Burke 1935 rodent ? Pareumys sp. Peterson 1919 rodent Ardynomys occidentalis Burke 1936 rodent

¹Alroy 2002; ²Asher et al. 2002