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Coconino Sandstone is a geologic formation named after its exposure in Coconino County, Arizona. This formation spreads across the Colorado Plateau province of the United States, including northern Arizona, northwest Colorado, Nevada, and Utah. Vertebrate tracks known as Chelichnus gigas from the Coconino Sandstone in Grand Canyon.
The Middle Permian Toroweap Formation is a thin, darker geologic unit, between the brighter colored units of the Kaibab Limestone above, and Coconino Sandstone below. It is a prominent unit in Grand Canyon, Arizona, Southwestern United States, found through sections of the South Rim, Grand Canyon, and the North Rim, of the Kaibab Plateau; also the Kaibab's southeast extension to Cape Royal ...
The presence of Dimetropus and Ichniotherium suggests a late Artinskian to Kungurian age for the Hermit Formation because the it is overlain by the late Kungurian Coconino Sandstone. This assemblage of vertebrate trace fossils is an abundant and relatively diverse collection of reptile and anamniote tracks and rarer synapsid tracks. [10]
Tapeats Sandstone averages 525 million years old and is made of medium- to coarse-grained sand and conglomerate that was deposited on an ancient shore (see 3a in figure 1). [11] Ripple marks are common in the upper members of this dark brown thin-bedded layer. Fossils and imprint trails of trilobites and brachiopods have also been found in the ...
Numerous fossils of bivalves were found in the Olenekian Virgin Limestone Member of the Moenkopi Formation, in south-western Utah. The discovery of 27 species from 18 genera of two subclasses in these sites in 2013 cast doubt on previous claims that the bivalve fauna only recovered in the Middle Triassic after the end-Permian mass extinction ...
Further east in the Coconino Plateau region, the lithology, mineralogy, and fauna of the Fossil Mountain Member changes drastically where it grades laterally into sandy dolomite and dolomite that contains a restricted-marine fossil fauna and subordinate amounts of sandstone.
In the field of ichnology, Brand, along with Thu Tang, Andrew A. Snelling, and Steven Austin [14] has proposed that fossil tracks in the Grand Canyon's Coconino Sandstone point to underwater deposition, rather than desert wind deposition of dry sand.
The Shinumo Quartzite also known as the Shinumo Sandstone, is a Mesoproterozoic rock formation, which outcrops in the eastern Grand Canyon, Coconino County, Arizona, (Northern Arizona). It is the 3rd member of the 5-unit Unkar Group. The Shinumo Quartzite consists of a series of massive, cliff-forming sandstones and sedimentary quartzites.