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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.
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.
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 ...
The bottom layer is Organ Rock Shale, the next stratum is cliff-forming De Chelly Sandstone, and the upper layer is Moenkopi Formation capped by Shinarump Conglomerate. The rock ranges in age from Permian at the bottom to Late Triassic at the top. The buttes and mesas of Monument Valley are the result of the Organ Rock Shale being more easily ...
The Shinarump was laid down in braided streams that flowed through valleys eroded into the underlying Moenkopi Formation. [8] This member of the Chinle forms prominent cliffs with thickness up to 200 feet (60 m), and its name comes from a Native American word meaning "wolf's rump" (a reference to the way this member erodes into gray, rounded ...
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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 with a Shinarump Conglomerate caprock. The rock ranges in age from Permian at the bottom to Late Triassic at the top. The buttes and mesas of Monument Valley are the result of the Organ Rock Shale ...