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White River - Cedar Creek, Logan County, Colorado, USA

Formation	White River
Member	Cedar Creek
Age:	33.9 - 33.3 Ma Oligocene
Interval	Orellan
Number of Collections	2
Number of Occurrences	52

Recorded Sample Locations

Location	Region	Stratigraphic Name
Horsetail Creek	Logan County, Colorado, USA	White River - Cedar Creek

Associated Units

Stratigraphic Name	Age	Occurrence Records
Martin Canyon Beds	20.4 - 16.0 Ma Miocene	4
Pawnee Creek Beds	16.0 - 10.3 Ma Miocene	29
White River - Horsetail Creek	37.2 - 33.9 Ma Paleogene	45
White River - Vista	33.3 - 30.8 Ma Oligocene	16
White River - Brule - Cedar Creek	33.9 - 33.3 Ma Oligocene	48
White River - Brule - Scenic	33.9 - 33.3 Ma Oligocene	11

Recorded Fossils

Accepted Name	Type	Hierarchy	Age
Heptacodon sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Anthracotheriidae : *Heptacodon*	33.9 - 33.3 Ma Oligocene
Poebrotherium wilsoni species	7	Animalia : Chordata : Mammalia : Artiodactyla : Camelidae : Poebrotherium : *Poebrotherium wilsoni*	33.9 - 33.3 Ma Oligocene
Archaeotherium mortoni species	7	Animalia : Chordata : Mammalia : Artiodactyla : Entelodontidae : Archaeotherium : *Archaeotherium mortoni*	33.9 - 33.3 Ma Oligocene
Hypertragulus calcaratus species	7	Animalia : Chordata : Mammalia : Artiodactyla : Hypertragulidae : Hypertragulus : *Hypertragulus calcaratus*	33.9 - 33.3 Ma Oligocene
Hypisodus minimus species	7	Animalia : Chordata : Mammalia : Artiodactyla : Hypisodontidae : Hypisodus : *Hypisodus minimus*	33.9 - 33.3 Ma Oligocene
Leptochoerus sp. genus	6	Animalia : Chordata : Mammalia : Artiodactyla : Leptochoeridae : *Leptochoerus*	33.9 - 33.3 Ma Oligocene
Stibarus obtusilobus species	7	Animalia : Chordata : Mammalia : Artiodactyla : Leptochoeridae : Stibarus : *Stibarus obtusilobus*	33.9 - 33.3 Ma Oligocene
Leptomerycidae family	5	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae	33.9 - 33.3 Ma Oligocene
Leptomeryx esulcatus species	7	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae : Leptomeryx : *Leptomeryx esulcatus*	33.9 - 33.3 Ma Oligocene
Leptomeryx evansi species	7	Animalia : Chordata : Mammalia : Artiodactyla : Leptomerycidae : Leptomeryx : *Leptomeryx evansi*	33.9 - 33.3 Ma Oligocene
Merycoidodontidae family	5	Animalia : Chordata : Mammalia : Artiodactyla : Merycoidodontidae	33.9 - 33.3 Ma Oligocene
Daphoenus vetus species	7	Animalia : Chordata : Mammalia : Carnivora : Amphicyonidae : Daphoenus : *Daphoenus vetus*	33.9 - 33.3 Ma Oligocene
Hesperocyon coloradensis species	7	Animalia : Chordata : Mammalia : Carnivora : Canidae : Hesperocyon : *Hesperocyon coloradensis*	33.9 - 33.3 Ma Oligocene
Canis gregarius species	7	Animalia : Chordata : Mammalia : Carnivora : Canidae : Hesperocyon : *Canis gregarius*	33.9 - 33.3 Ma Oligocene
Dinictis sp. genus	6	Animalia : Chordata : Mammalia : Carnivora : Nimravidae : *Dinictis*	33.9 - 33.3 Ma Oligocene
Palaeogale sectoria species	7	Animalia : Chordata : Mammalia : Carnivora : Palaeogale : *Palaeogale sectoria*	33.9 - 33.3 Ma Oligocene
Drassonax harpagops species	7	Animalia : Chordata : Mammalia : Carnivora : Phocidae : Drassonax : *Drassonax harpagops*	33.9 - 33.3 Ma Oligocene
Oligomyotis sp. genus	6	Animalia : Chordata : Mammalia : Chiroptera : Vespertilionidae : *Oligomyotis*	33.9 - 33.3 Ma Oligocene
Hyaenodon horridus species	7	Animalia : Chordata : Mammalia : Hyaenodontidae : Hyaenodon : *Hyaenodon horridus*	33.9 - 33.3 Ma Oligocene
Megalagus turgidus species	7	Animalia : Chordata : Mammalia : Lagomorpha : Leporidae : Megalagus : *Megalagus turgidus*	33.9 - 33.3 Ma Oligocene
Palaeolagus burkei species	7	Animalia : Chordata : Mammalia : Lagomorpha : Leporidae : Palaeolagus : *Palaeolagus burkei*	33.9 - 33.3 Ma Oligocene
Palaeolagus intermedius species	7	Animalia : Chordata : Mammalia : Lagomorpha : Leporidae : Palaeolagus : *Palaeolagus intermedius*	33.9 - 33.3 Ma Oligocene
Centetodon marginalis species	7	Animalia : Chordata : Mammalia : Lipotyphla : Geolabididae : Centetodon : *Centetodon marginalis*	33.9 - 33.3 Ma Oligocene
Ankylodon annectens species	7	Animalia : Chordata : Mammalia : Erinaceomorpha : Amphilemuridae : Ankylodon : *Ankylodon annectens*	33.9 - 33.3 Ma Oligocene
Herpetotheriidae family	5	Animalia : Chordata : Mammalia : Herpetotheriidae	33.9 - 33.3 Ma Oligocene
Peratherium fugax species	7	Animalia : Chordata : Mammalia : Marsupialia : Herpetotheriidae : Herpetotherium : *Peratherium fugax*	33.9 - 33.3 Ma Oligocene
Domnina gradata species	7	Animalia : Chordata : Mammalia : Soricomorpha : Soricidae : Domnina : *Domnina gradata*	33.9 - 33.3 Ma Oligocene
Leptictidae family	5	Animalia : Chordata : Mammalia : Pilosa : Leptictidae	33.9 - 33.3 Ma Oligocene
Arctoryctes galbreathi species	7	Animalia : Chordata : Mammalia : Proscalopidae : Oligoscalops : *Arctoryctes galbreathi*	33.9 - 33.3 Ma Oligocene
Proscalops sp. genus	6	Animalia : Chordata : Mammalia : Proscalopidae : *Proscalops*	33.9 - 33.3 Ma Oligocene
Domnina compressa species	7	Animalia : Chordata : Mammalia : Soricomorpha : Soricidae : Pseudotrimylus : *Domnina compressa*	33.9 - 33.3 Ma Oligocene
Miohippus obliquidens species	7	Animalia : Chordata : Mammalia : Perissodactyla : Equidae : Miohippus : *Miohippus obliquidens*	33.9 - 33.3 Ma Oligocene
Hyracodon nebraskensis species	7	Animalia : Chordata : Mammalia : Perissodactyla : Hyracodontidae : Hyracodon : *Hyracodon nebraskensis*	33.9 - 33.3 Ma Oligocene
Subhyracodon occidentalis species	7	Animalia : Chordata : Mammalia : Perissodactyla : Rhinocerotidae : Subhyracodon : *Subhyracodon occidentalis*	33.9 - 33.3 Ma Oligocene
Altasciurus relictus species	7	Animalia : Chordata : Mammalia : Rodentia : Aplodontidae : Altasciurus : *Altasciurus relictus*	33.9 - 33.3 Ma Oligocene
Eumys elegans species	7	Animalia : Chordata : Mammalia : Rodentia : Cricetidae : Eumys : *Eumys elegans*	33.9 - 33.3 Ma Oligocene
Scottimus ambiguus species	7	Animalia : Chordata : Mammalia : Rodentia : Muridae : Scottimus : *Scottimus ambiguus*	33.9 - 33.3 Ma Oligocene
Paradjidaumo trilophus species	7	Animalia : Chordata : Mammalia : Rodentia : Eomyidae : Paradjidaumo : *Paradjidaumo trilophus*	33.9 - 33.3 Ma Oligocene
Ecclesimus tenuiceps species	7	Animalia : Chordata : Mammalia : Rodentia : Florentiamyidae : Ecclesimus : *Ecclesimus tenuiceps*	33.9 - 33.3 Ma Oligocene
Ischyromys typus species	7	Animalia : Chordata : Mammalia : Rodentia : Ischyromyidae : Ischyromys : *Ischyromys typus*	33.9 - 33.3 Ma Oligocene
Pelycomys placidus species	7	Animalia : Chordata : Mammalia : Rodentia : Allomyidae : Pelycomys : *Pelycomys placidus*	33.9 - 33.3 Ma Oligocene
Diplolophus insolens species	7	Animalia : Chordata : Mammalia : Rodentia : Geomyidae : Diplolophus : *Diplolophus insolens*	33.9 - 33.3 Ma Oligocene
Cedromus wardi species	7	Animalia : Chordata : Mammalia : Rodentia : Sciuridae : Cedromus : *Cedromus wardi*	33.9 - 33.3 Ma Oligocene

References

Galbreath E. C. (1953) A contribution to the Tertiary geology and paleontology of northeastern Colorado, University of Kansas Paleontological Contributions Vertebrata 4, 1-120

Reed C. A. (1956) A new species of the fossorial mammal Arctoryctes from the Oligocene of Colorado, Fieldiana Geology 10 24

Mawby J. E. (1960) A new American occurrence of Heterosorex Gaillard, Journal of Paleontology 34 5, 950-956

Galbreath E. C. (1962) , Transactions of the Kansas Academy of Sciences 65 4

Korth W. W. (1981) New Oligocene rodents from western North America, Annals of Carnegie Museum 50 10, 289-318

Korth W. W. (1989) Stratigraphic occurrence of rodents and lagomorphs in the Orella Member, Brule Formation (Oligocene), northwestern Nebraska, Contributions to Geology, University of Wyoming 27 1, 15-20

Korth W. W. (1994) Middle Tertiary marsupials (Mammalia) from North America, Journal of Paleontology 68 2, 376-397

Wang X. (1994) Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae), Bulletin of the American Museum of Natural History 221, 1-207

Alroy J. (2002) Synonymies and reidentifications of North American fossil mammals

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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