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 (40.4 - 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"
Mammalia
 Leptictida - Leptictidae
Leptictidae indet.1 Gill 1872 eutherian
 Rodentia - Eomyidae
Adjidaumo aff. minimus Matthew 1903 rodent
 Rodentia - Eutypomyidae
Eutypomys sp. Matthew 1905 rodent
 Rodentia - Ischyromyidae
Ischyromys cf. douglassi Black 1968 rodent
 Rodentia - Cylindrodontidae
Ardynomys occidentalis Burke 1936 rodent
Pseudocylindrodon sp. Burke 1935 rodent
? Pareumys sp. Peterson 1919 rodent
 Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856 rabbit
? Megalagus sp. Walker 1931 rabbit
said to be new
 Lipotyphla - Geolabididae
Centetodon cf. kuenzii Lillegraven et al. 1981 placental
 Perissodactyla - Brontotheriidae
Brontotheriidae indet. Marsh 1873 brontothere
 Perissodactyla - Hyracodontidae
? Hyracodon sp. Leidy 1856 odd-toed ungulate
 Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821 rhinoceros
 Perissodactyla - Tapiridae
? Colodon cingulatus Douglass 1902 tapir
 Perissodactyla - Equidae
Mesohippus sp. Marsh 1875 anchitheriine horse
 Tribosphenida - Heterosoricidae
Domnina cf. thompsoni Simpson 1941 placental
 Tribosphenida - Proscalopidae
Cryptoryctes sp. Reed 1954 placental
 Tribosphenida - Apternodontidae
Oligoryctes cf. cameronensis Hough 1956 placental
Apternodus baladontus2 Asher et al. 2002 placental
 Carnivora - Miacidae
"Miacis" sp. Cope 1872 carnivoran
said to be new
 Carnivora - Canidae
? Hesperocyon sp. Scott 1890 canid
 Ferae - Epoicotheriidae
Epoicotherium sp. Simpson 1927 placental
 Ungulata - Agriochoeridae
Protoreodon sp. Scott and Osborn 1887 agriochoerid
 Ungulata - Leptomerycidae
Hendryomeryx cf. defordi Wilson 1974 ruminant
 Insectivora -
Insectivora indet. Bowdich 1821 insectivoran
said to be a new genus and species
 Hyaenodonta - Hyaenodontidae
Hyaenodon sp. Laizer and Parieu 1838 eutherian
 Theriiformes - Herpetotheriidae
Herpetotherium valens Lambe 1908 marsupial
described by Korth 1994a
Copedelphys cf. titanelix Matthew 1903 marsupial