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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.
From top to bottom: Rounded tan domes of the Navajo Sandstone, layered red Kayenta Formation, cliff-forming, vertically jointed, red Wingate Sandstone, slope-forming, purplish Chinle Formation, layered, lighter-red Moenkopi Formation, and white, layered Cutler Formation sandstone. Picture from Glen Canyon National Recreation Area, Utah.
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.
It is exposed as a topographic bench 1200 feet (365 m) below the top of Island in the Sky (thus earning its name) and along the White Rim Road. A fossilized offshore sand bar made of the White Cliff Sandstone is also exposed in the Elaterite Basin. A tarry dark-brown oil called elaterite seeps out of the structure, giving the basin its name.
Moenkopi Formation (mudstone formed 245 million years ago) nearest the outer foot of the rim Soils around the crater are brown, slightly to moderately alkaline, gravelly or stony loam of the Winona series; on the crater rim and in the crater itself, the Winona is mapped in a complex association with rock outcrop.
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]
Overlying the Moenkopi Fm is the Chinle Fm, which has produced some isolated Phytosaur teeth from the Muddy Mountains, some associated bones of Metoposaurs from the Spring Mountains, and abundant petrified wood where ever else it is exposed. These unit record the transition from tidal flats to swamping fluvial environments in southern Nevada ...
The Glen Canyon Group is a geologic group of formations that is spread across the U.S. states of Nevada, Utah, northern Arizona, north west New Mexico and western Colorado.It is called the Glen Canyon Sandstone in the Green River Basin of Colorado and Utah.