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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 .
Natural gas E&P player EnCana (NYS: ECA) stuck a giant for-sale sign in the middle of its Barnett Shale front yard last week. The company is looking to divest its 52,000-acre stake in the North ...
The Piceance Basin contains one of the thickest and richest oil shale deposits in the world and is the focus of most on-going oil shale research and development extraction projects in the U.S. The Piceance Basin has an estimated 1.525 trillion barrels of in-place oil shale resources, and an estimated 43.3 billion tons of in-place nahcolite ...
In 2009, EnCana's oil business was spun-off as Cenovus Energy. [13] In November 2011, a potential buyer backed out of a $45 million deal to buy the company's gas field in Pavillion, Wyoming. [14] In December 2011, the company sold the majority of its natural gas producing assets in the Barnett Shale. [15]
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 ...
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 Menefee Formation consists of fluvial sandstone, shale, and coal.Based on ammonite biostratigraphy, the age of the Menefee Formation can be constrained to 84.2-79 million years (), based on the presence of Baculites perplexus in the overlying Cliff House Sandstone, and ammonites from the late Santonian in the underlying Point Lookout Sandstone.
In the late Cretaceous Period, the Mancos Shale was deposited on top of the Dakota Sandstone, which is the rock formation that can be found under much of Colorado. The beds of the Mancos Shale are "fine-grained sand-stones, mudstones, and shales" which accumulated in the deep water of the Cretaceous Sea.