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Wasatchian
The Wasatchian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 55,400,000 to 50,300,000 years Before Present, BP lasting . It is usually considered to be within the Eocene, more specifically the Early Eocene. The Wasatchian is preceded by the Clarkforkian and followed by the Bridgerian NALMA stages. Definition The age is named after the Wasatch Formation, a highly fossiliferous stratigraphic unit stretching across six of the United States from Idaho and Montana in the north through Utah and Wyoming to Colorado and New Mexico in the south. Substages The Wasatchian is considered to contain the following substages: * Sandcouleean: shares lower boundary with the beginning of the Wasatchian age and shares upper boundary with the base of the Graybullian. * Graybullian: shares lower boundary with the end of the Sandcouleean subage and upper boundary with the ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wasatch Formation
The Wasatch Formation (Tw)Shroba & Scott, 2001, p.3 is an extensive highly fossiliferous Formation (geology), geologic formation stretching across several basins in Idaho, Montana, Wyoming, Utah and western Colorado.Wasatch Formation at Fossilworks.org It preserves fossils dating back to the Early Eocene Period (geology), period. The formation defines the Wasatchian or Lostcabinian (55.8 to 50.3 Ma), a period of time used within the North American land mammal age, NALMA classification, but the formation ranges in age from the Clarkforkian (56.8 to 55.8 Ma) to Bridgerian (50.3 to 46.2 Ma). Wasatch fauna consists of many groups of mammals, including numerous genera of primates, artiodactyls, perissodactyls, rodents, carnivora, insectivora, hyaenodonta and others. A number of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willwood Formation
The Willwood Formation is a sedimentary sequence deposited during the late Paleocene to early Eocene, or Clarkforkian, Wasatchian and Bridgerian in the NALMA classification.Willwood Formation at .orgNeasham & Vondra, 1972 Description It consists of fine grained clastic rocks ( and ) interbedded with medium grained clastic rocks ( |
DeBeque Formation
The DeBeque Formation is a geologic formation in Colorado's Piceance Basin,Bown & Kihm, 1981 preserving fossils which date back to the Late Paleocene to Early Eocene period (Clarkforkian to Wasatchian in the NALMA classification.DeBeque Formation at .orgHirsch et al., 1997 Examples of these fossils are held in the University of Colorado Museum of Natural History. Wasatchian correlations See also *[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indian Meadows Formation
The Indian Meadows Formation is a Wasatchian geologic formation in Wyoming. It preserves fossils dating back to the Ypresian stage of the Eocene period.Indian Meadows Formation at .org Fossil content The following fossils have been reported from the formation:Winterfeld & Conard, 1983Keefer & Troyer, 1964Mammals ;Primates * '' Absarokius abbotti'' * ''[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pass Peak Formation
The Pass Peak Formation is a Wasatchian Formation (geology), geologic formation in Wyoming. It preserves fossils dating back to the Ypresian stage of the Eocene Period (geology), period.Pass Peak Formation at Fossilworks.org Fossil content The following fossils have been found in the formation:Dorr Jr., 1978Mammals ;Artiodactyls * ''Diacodexis, Diacodexis sp.'' ;Erinaceomorpha * ''Diacodon, Diacodon celatus'' ;Glires * ''Paramys, Paramys copei'' ;Macroscelidea * Adapisoricidae, Adapisoricidae indet. ;Perissodactyla * ''Hyracotherium, Hyracotherium cf. vasacciense'' ;Placentalia * ''Hyopsodus, Hyopsodus cf. wortmani''Wasatchian correlations See ...
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