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The Moenkopi Formation is a geological formation that is spread across the U.S. states of New Mexico, northern Arizona, Nevada, southeastern California, eastern Utah and western Colorado. This unit is considered to be a group in Arizona.
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Moenkopia (meaning "for Moenkopi") is an extinct genus of prehistoric sarcopterygians from the Coelacanthidae [1] found in the Middle Triassic Moenkopi Formation of Arizona.The type, and only species, M. wellesi, was named in 1961 in honour of Samuel Paul Welles. [2]
Mitchell Butte is composed of three principal strata. The bottom layer is slope-forming Organ Rock Shale, the next stratum is cliff-forming De Chelly Sandstone, and the upper layer is Moenkopi Formation. [6] The rock ranges in age from Permian at the bottom to Triassic at the top. The buttes and mesas of Monument Valley are the result of the ...
Ripple marks in Moenkopi Formation rock. Local climatic conditions were wetter and more tropical in the Early Triassic than they were previously. In the Capitol Reef area the resulting Moenkopi Formation is divided into four members (from oldest to youngest): [6] Black Dragon Member; Sinbad Limestone Member, Torrey Member, and; Moody Canyon Member.
Gray Whiskers is composed of three principal strata. The bottom layer is slope-forming Organ Rock Shale, the next stratum is cliff-forming De Chelly Sandstone, and the upper layer is Moenkopi Formation. [7] The rock ranges in age from Permian at the bottom to Triassic at the top. The buttes and mesas of Monument Valley are the result of the ...
The Oracle is set on a fin and is composed of two principal strata of sandstone and mudstone: Permian Cutler Formation capped by Early Triassic Moenkopi Formation. There is an unconformity between the Cutler and the Moenkopi layers. [3] The reddish coloration of the rock is a result of varying amounts of hematite. [4]
The bottom layer is slope-forming Organ Rock Shale, the next stratum is cliff-forming De Chelly Sandstone, and the upper layer is Moenkopi Formation. The rock ranges in age from Permian at the bottom to Early Triassic at the top. The buttes and mesas of Monument Valley are the result of the Organ Rock Shale being more easily eroded than the ...