The Wasatch Formation (Tw)[1] is an extensive highly fossiliferous geologic formation stretching across several basins in Idaho, Montana, Wyoming, Utah and western Colorado.[2] It preserves fossils dating back to the Early Eocene period. The formation defines the Wasatchian or Lostcabinian (55.8 to 50.3 Ma), a period of time used within the 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 birds, several reptiles and fish and invertebrates complete the diverse faunal assemblages. Fossil flora and ichnofossils also have been recovered from the formation.
The formation, first named as Wasatch Group in 1873 by Ferdinand Vandeveer Hayden, was deposited in alluvial, fluvial and lacustrine environments and comprises sandstones, siltstones, mudstones and shales with coal or lignite beds representing wet floodplain settings.
The Wasatch Formation is an unconventional tight gas reservoir formation in the Uinta and Piceance Basins of Utah and the coal seams of the formation are mined in Wyoming. At the Fossil Butte National Monument, the formation crops out underlying the Green River Formation. In the Silt Quadrangle of Garfield County, Colorado, the formation overlies the Williams Fork Formation.[3]
The WasatchFormation (Tw) is an extensive highly fossiliferous geologic formation stretching across several basins in Idaho, Montana, Wyoming, Utah and...
National Forest WasatchFormation, a geologic formation in Wyoming Wasatch Mountain (Colorado), a summit near Telluride, Colorado Wasatch Plateau, a plateau...
The Wasatch Range (/ˈwɑːsætʃ/ WAH-satch) or Wasatch Mountains is a mountain range in the western United States that runs about 160 miles (260 km) from...
(NALMA classification) DeBeque Formation of Colorado and the Clarkforkian WasatchFormation to Tiffanian Fort Union Formation in Wyoming. Three species of...
referred to as the Green River Formation. In addition to this fossil-bearing strata, a large portion of the WasatchFormation, river and stream sediments...
latest Paleocene Buckman Hollow local fauna, Chappo Member of the WasatchFormation, Lincoln County, southwestern Wyoming". Palaeontologia Electronica...
the surface of the plateau, including the limestone layers of the WasatchFormation. The sandstone layers of the Kaiparowits Plateau have become a unique...
The Almy Formation is a geologic formation in Wyoming. It preserves fossils dating back to the Paleogene period. Earth sciences portal Paleontology portal...
uranium, contained in sandstones. (See Uranium mining in Wyoming). The WasatchFormation (Eocene) contains the uranium ore "roll front" type deposits found...
described in 2014 based on lower teeth and jaw fragments found in the WasatchFormation of Bitter Creek, Wyoming. The genus is named in honor of the singer...
the Lance Formation. The next unit exposed is the Fort Union Formation deposited in the Paleocene, followed by lower Eocene WasatchFormation. Most of...
(200 m)-thick Pink Member of the locally Eocene-aged Claron Formation (previously called the WasatchFormation). Channelized conglomerates of this member can be...
Drinker Cope discovered another fragmentary set of fossils at the WasatchFormation, New Mexico. Cope considered the fossils to be of a distinct genus...
ground. The project was proposed for deep coalbeds in the Fort Union-WasatchFormation. The Roland coalbed, which was being surface mined at the Wyodak Mine...
the WasatchFormation, which had become a rather generic name by the US Geological Survey for mudstone-sandstone strata of Eocene age. The formation is...
south slope of the Uinta Mountains, the WasatchFormation overlies the Cretaceous Mesaverde Sandstone. The Wasatch Conglomerate formed as the coarsest debris...
sequence of Eocene shale and sandstone known as the Green River and WasatchFormations. These layers in turn rest on a Cretaceous layer known as the Mesaverde...
United States WasatchFormation of the western United States Itaboraian formations Itaboraí Formation of Brazil Laguna del Hunco Formation of Argentina...
heterodon is from the Eocene-age WasatchFormation of Wyoming, A. wartheni is from the Eocene-age Wildwood Formation (also known as the "Wildwood alligatorid"...
Union Formation in the east, made up of the Tongue River, Lebo and Tullock members is a remnant of Paleocene deposition. It is overlain by Wasatch Formation...
England Silveirinha Formation of Portugal Wasatchian formations Nanjemoy Formation of the eastern United States WasatchFormation of the western United...
Uncompahgre Plateau and the San Juan Mountains to the south and finally, the Wasatch Mountains of Utah and the ranges of eastern Idaho to the west. The lithology...
England Silveirinha Formation of Portugal Wasatchian formations Nanjemoy Formation of the eastern United States WasatchFormation of the western United...
this formation. List of fossiliferous stratigraphic units in Wyoming Paleontology in Wyoming Tatman FormationWasatchFormation Willwood Formation at Fossilworks...
stratigraphic units in Wyoming Paleontology in Wyoming WasatchFormation Willwood Formation Tatman Formation at Fossilworks.org Wing et al., 1995 Wing, S. L...
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