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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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Tatman Formation
The Tatman Formation is a Wasatchian geologic formation in Wyoming. It preserves fossils dating back to the Ypresian stage of the Eocene period.Tatman Formation at .org Fossil content The following fossils have been recovered from the formation:Wing et al., 1995Flora * '' Allantoidiopsis erosa'' * '' Cercidiphyllum genetrix'' * ''[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margaret Formation
The Margaret Formation is a geologic formation of the Eureka Sound Group in the Sverdrup Basin in Northwest Territories and Nunavut, Canada. The unit belonging to the Eureka Sound Group which crops out at Ellesmere Island preserves fossils dating back to the Early Eocene period, or Wasatchian in the NALMA classification.Margaret Formation at .org The Margaret Formation comprises s, sandy |
Golden Valley Formation
The Golden Valley Formation is a stratigraphic unit of Late Paleocene to Early Eocene age in the Williston Basin of North Dakota.Hickey, 1977 It is present in western North Dakota and was named for the city of Golden Valley by W.E. Benson and W.M. Laird in 1947.Benson, W.E. and Liard, W.M. (1947). Eocene of North Dakota. ''Geological Society of America Bulletin'', vol. 60, pp. 1166–1167. It preserves significant assemblages of fossil plants and vertebrates,Jepsen, G.L. 1963. Eocene vertebrates, coprolites, and plants in the Golden Valley Formation of western North Dakota. Geological Society of America Bulletin, vol. 74, pp. 673–684. as well as mollusk and insect fossils. History The Golden Valley Formation was named in 1947. Between 1958–61, a large field expedition conducted by the Yale Peabody Museum recovered a plethora of crocodilian remains from the White Butte and Turtle Valley sites (collectively referred to as the South Heart Locality) within the Golden Valley Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coldwater Beds
The Coldwater Beds are a Formation (geology), geologic formation of the Okanagan Highlands in British Columbia, Canada. They preserve fossils dating back to the Ypresian stage of the Eocene Period (geology), period, or Wasatchian in the North American land mammal age, NALMA classification.Coldwater Beds at Fossilworks.org The formation comprises mudstones, shales and tuffs deposited in a lacustrine depositional environment, environment and has provided many insect fossils, as well as indeterminate birds and fossil flora.Quilchena at Fossilworks.org Description The Col ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bridgerian
The Bridgerian 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 50,300,000 to 46,200,000 years BP lasting . It is usually considered to overlap the Ypresian and Lutetian within the Eocene epoch. The Bridgerian is preceded by the Wasatchian and followed by the Uintan NALMA stages. Substages The Bridgerian is considered to contain the following substages: *Twinbuttean: Lower boundary source of the base of the Bridgerian (approximate). *Lutetian which is contained within the Middle Eocene sharing the lower boundary. The Lutetian overlaps with New Zealand's Arnold epoch, Dannevirke Dannevirke ( "Earthworks (archaeology), work of the Danes", a reference to Danevirke; or ''Tāmaki-nui-a-Rua'', the area where the town is) is a rural service town in the Manawatū-Whanganui region of the North Island, New Zealand. It is the ... epoch, Bortonian stage, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clarkforkian
The Clarkforkian 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 56,800,000 to 55,400,000 years BP lasting . Considered to be within the Paleocene, more specifically the Late Paleocene, the Clarkforkian shares its upper boundary with the Thanetian. The Clarkforkian is preceded by the Tiffanian and followed by the Wasatchian NALMA stages. Substages It is considered to contain the following substages: *Cf3: (shares the upper boundary) and lower boundary source of the base of Clarkforkian (approximate) and upper boundary source of the base of the Ypresian (approximate). *Cf2: Is the lower boundary source of the base of the Clarkforkian (approximate) *Cf1: Upper boundary source of the base of the Ypresian (approximate) Fauna Notable mammals Multituberculata - non-therian mammals * ''Ectypodus'', neoplagiaulacid multituberculate Metatheria - marsupial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
North American Land Mammal Age
The North American land mammal ages (NALMA) establishes a geologic timescale for North American fauna beginning during the Late Cretaceous and continuing through to the present. These periods are referred to as ages or intervals (or stages when referring to the rock strata of that age) and were established using geographic place names where fossil materials were obtained. System The North American land-mammal-age system was formalized in 1941 as a series of provincial land-mammal ages. The system was the standard for correlations in the terrestrial Cenozoic record of North America and was the source for similar time scales dealing with other continents. The system was revised into a formal chronostratigraphic system. This approach is nominally justified by international stratigraphic codes; it holds that first appearances of individual species in particular sections are the only valid basis for naming and defining the land-mammal ages. The basic unit of measure is the first/last ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
