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Cook Ranch - middle, Beaverhead County, Montana, USA

Formation	Cook Ranch
Member	middle
Age:	33.9 - 33.3 Ma Oligocene
Interval	Orellan
Number of Collections	2
Number of Occurrences	19

Recorded Sample Locations

Location	Region	Stratigraphic Name
Sage Creek Formation	Beaverhead County, Montana, USA	Cook Ranch - middle

Associated Units

Stratigraphic Name	Age	Lithology	Occurrence Records
Blacktail Deer Creek	24.8 - 20.4 Ma Cenozoic	claystone/sandstone	6
Cook Ranch - lower	37.2 - 33.9 Ma Paleogene		13
Dell Beds	46.2 - 40.4 Ma Eocene		30
Renova - Climbing Arrow	37.2 - 33.9 Ma Paleogene	claystone	172
Sage Creek - upper	33.9 - 33.3 Ma Oligocene		44

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Poebrotherium sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Camelidae : *Poebrotherium*	33.9 - 33.3 Ma Oligocene
Leptomeryx sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae : *Leptomeryx*	33.9 - 33.3 Ma Oligocene
Leptomeryx evansi species	7	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae : Leptomeryx : *Leptomeryx evansi*	33.9 - 33.3 Ma Oligocene
Canis gregarius species	7	Animalia : Chordata : Mammalia : Carnivora : Canidae : Hesperocyon : *Canis gregarius*	33.9 - 33.3 Ma Oligocene
Palaeolagus sp. genus	6	Animalia : Chordata : Mammalia : Lagomorpha : Leporidae : *Palaeolagus*	33.9 - 33.3 Ma Oligocene
Palaeolagus burkei species	7	Animalia : Chordata : Mammalia : Lagomorpha : Leporidae : Palaeolagus : *Palaeolagus burkei*	33.9 - 33.3 Ma Oligocene
Copedelphys stevensoni species	7	Animalia : Chordata : Mammalia : Marsupialia : Herpetotheriidae : Copedelphys : *Copedelphys stevensoni*	33.9 - 33.3 Ma Oligocene
Peratherium fugax species	7	Animalia : Chordata : Mammalia : Marsupialia : Herpetotheriidae : Herpetotherium : *Peratherium fugax*	33.9 - 33.3 Ma Oligocene
Oligoscalops sp. genus	6	Animalia : Chordata : Mammalia : Proscalopidae : *Oligoscalops*	33.9 - 33.3 Ma Oligocene
Soricidae family	5	Animalia : Chordata : Mammalia : Soricomorpha : Soricidae	33.9 - 33.3 Ma Oligocene
Mesohippus sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Equidae : *Mesohippus*	33.9 - 33.3 Ma Oligocene
Hyracodon sp. genus	6	Animalia : Chordata : Mammalia : Perissodactyla : Hyracodontidae : *Hyracodon*	33.9 - 33.3 Ma Oligocene
Brachygaulus leistneri species	7	Animalia : Chordata : Mammalia : Rodentia : Aplodontiidae : Brachygaulus : *Brachygaulus leistneri*	33.9 - 33.3 Ma Oligocene
Prosciurus sp. genus	6	Animalia : Chordata : Mammalia : Rodentia : Allomyidae : *Prosciurus*	33.9 - 33.3 Ma Oligocene
Eumys sp. genus	6	Animalia : Chordata : Mammalia : Rodentia : Cricetidae : *Eumys*	33.9 - 33.3 Ma Oligocene
Eumys elegans species	7	Animalia : Chordata : Mammalia : Rodentia : Cricetidae : Eumys : *Eumys elegans*	33.9 - 33.3 Ma Oligocene
Adjidaumo minimus species	7	Animalia : Chordata : Mammalia : Rodentia : Eomyidae : Adjidaumo : *Adjidaumo minimus*	33.9 - 33.3 Ma Oligocene
Heliscomys sp. genus	6	Animalia : Chordata : Mammalia : Rodentia : Geomyidae : *Heliscomys*	33.9 - 33.3 Ma Oligocene

References

Tabrum A. R., Prothero D. R., et al (1996) Magnetostratigraphy and biostratigraphy of the Eocene-Oligocene transition, southwestern Montana, The Terrestrial Eocene-Oligocene Transition in North America, 278-311

Korth W. W., Tabrum A. R. (2011) A new aplodontoid rodent (Mammalia) from the early Oligocene (Orellan) of Montana and a suggested origin for the family Mylagaulidae, Annals of Carnegie Museum 80 1, 67-81

Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!

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