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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.
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]
Examples of this formation, some that still show fossilized ripple marks and mudcracks, can be seen in the northern and western parts of the park. Another period of erosion returned, creating a third unconformity. The brightly colored shales of the slope-forming Chinle Formation were laid down on top of this eroded surface.
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.
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.
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The Sinbad Limestone of the greater Moenkopi formation lies at the Northern end the San Rafael Swell in the state of Utah. [ 3 ] [ 5 ] Portions of the San Rafael Swell region, including the Sinbad Limestone, have been prospected for oil and other minerals as early as 1918 [ 3 ] and more recently in 2007. [ 4 ]
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.