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The Mesaverde Formation was first described by W.H.Holmes in 1877 during the Hayden Survey.Holmes described the formation in the northern San Juan Basin as consisting of three units, which were a "Lower Escarpment" consisting of 40 m of ledge- and cliff-forming massive sandstone; a "Middle Coal Group" consisting of up to 300 m of thick slope-forming sandstone, shale, marl, and lignite; and an ...
The sandstone was first described by A. J. Collier for exposures in cliffs at Point Lookout, in Mesa Verde National Park, Montezuma County, Colorado, in the Paradox Basin, [6] and later described by Allen and Balk in 1954 as part of the Mesaverde Group in the San Juan Basin in New Mexico. [7]
Chinle Group/Sheep Pen Sandstone: Triassic: Chinle Group/Sloan Canyon Formation: ... Mesaverde Group/Crevasse Canyon Formation: Cretaceous: Mesaverde Group/Menefee ...
The Williams Fork Formation is a Campanian to Maastrichtian (Edmontonian) geologic formation of the Mesaverde Group in Colorado. Dinosaur remains are among the fossils that have been recovered from the formation, most notably Pentaceratops sternbergii,. [1]
The main entrance road to Mesa Verde National Park traverses the east flank of Point Lookout as it climbs the escarpment of the East Rim of Mesa Verde. Point Lookout is located on the Colorado Plateau, and is composed of 400-foot thick Cretaceous Point Lookout Sandstone, which is the oldest of the three formations that make up the Mesaverde Group which is common to the Mesa Verde region. [5]
The Cliff House Sandstone was first described by W.H.Holmes in 1877 during the Hayden Survey as the "Upper Escarpment" of the Mesaverde Formation. [6] A.J. Collier redesignated this unit in 1919 as the Cliff House Sandstone and raised the Mesaverde Formation to group rank.
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.
Stratigraphically the Mancos Shale fills the interval between the Dakota and the Mesaverde Group. [2] The lower marine Mancos Shale conformably intertongues with terrestrial sandstones and mudstones of the Dakota and in its upper part grades into and intertongues with the Mesaverde Group. The shale tongues typically have sharp basal contacts ...