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The Mancos Shale or Mancos Group is a Late Cretaceous (Upper Cretaceous) geologic formation of the Western United States. The Mancos Shale was first described by Cross and Purington in 1899 [ 1 ] and was named for exposures near the town of Mancos, Colorado .
The Ferron Sandstone Member of the Mancos Shale is a geologic unit in Utah. It preserves fossils dating back to the Cretaceous period; and more specifically the middle Turonian. [1] [2] Named by Lupton (1916), the formation is readily divisible into upper and lower members on the basis of both lithologic character and depositional history ...
It overlies and intertongues with the Mancos Shale and is overlain and intertongues with the Crevasse Canyon Formation. The formation has few faunal fossils, but the age is likely late Turonian to early Coniacian. [2] [3] The formation is interpreted as an offshore marine transgression-regression sequence. [2]
This article contains a list of fossil-bearing stratigraphic units in the state of New Mexico ... Mancos Shale: Cretaceous: Mancos Group/Gullup Formation: Cretaceous ...
The unit was first designated the Tres Hermanos Sandstone member of the Mancos Shale by C.L. Herrick in 1900. [5] In 1983, Hook et al. raised the unit to formation rank and interpreted it as a clastic wedge directed to the northeast into the Mancos Shale. They also divided the formation into the Atarque Sandstone Member, the Carthage Member ...
The Mancos is composed mostly of shale but two of its members, the Ferron and Muley Canyon, are sandstone that were laid down when relative sea level temporarily dropped. The five Mancos members from oldest to youngest are: Tununk Shale, Ferron Sandstone, Blue Gate Shale, Muley Canyon, and; Masuk. Mancos Shale slopes along the east side of ...
A new study led by scientists at the Royal Ontario Museum (ROM), after analyzing pristine fossil samples from the Burgess Shale in British Columbia, concluded that O. alata was likely one of the ...
Many authors have emphasized the fact that the marine Dakota Sandstone on the Colorado Plateau is intertongued with the marine lower part of the Mancos Shale, resulting in valid lithostratigraphic names such as the Whitewater Arroyo Tongue of the Mancos Shale which is directly overlain by the Twowells Sandstone Tongue of the Dakota Sandstone. [2]