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The Early to Middle Permian White Rim Sandstone is the continental geologic formation deposited at the time of marine transgressions during the Permian Period. The coeval Toroweap Formation was laid down under marine conditions along the southwest margin of the North American continent and is found in northwest Arizona layered between Coconino Sandstone and the Kaibab Formation. The Toroweap is mostly from the Grand Canyon and just eastwards to Lee's Ferry-(Colorado River, Grand Canyon), south to the Verde Valley region (Sedona, Sycamore Canyon, Oak Creek Canyon), but the Toroweap also occurs within sections in southeast Utah, and also became overlain by the Kaibab Formation, specifically at the Circle Cliffs, west of the Waterpocket Fold. The White Rim Sandstone typically occurs above the Organ Rock Formation in southeast Utah, which sits upon the extensive Cedar Mesa Sandstone in southeast Utah.〔Blakey, Ranney, 2008. ''Ancient Landscapes of the Colorado Plateau'', p. XVIII, and ''Cross section restored to the end of Permian time showing how Pennsylvanian and Permian rocks thicken and thin across the tectonic elements.''-(4,000-10,000 ft), p. 34.〕 ==Occurrences in Utah== Moab, Utah is located in southeast Utah, about west of the Colorado border.〔Utah DeLorme Atlas & Gazetteer, pp. 32-33.〕 The Circle Cliffs lie about southwest from Moab,〔Utah DeLorme Atlas, pp. 32-33.〕 and east of Escalante and Boulder, Utah-(Utah State Route 12).〔Utah DeLorme Atlas, p. 52.〕 The Circle Cliffs are located in the northeast of Grand Staircase-Escalante National Monument. The cliffs also extend north-northwest adjacent the west perimeter of the Waterpocket Fold, Capitol Reef National Park. The fold is traversed by Burr Trail Road-Straton Road which has views toward the Circle Cliffs, southward, or westward. *Circle Cliffs, (extreme south)-southeast-Utah * *Moenkopi Formation * *Toroweap Formation-White Rim Sandstone * *Organ Rock Formation * *Cedar Mesa Sandstone *Moab, Utah — W. Colorado * *Moenkopi Formation * *White Rim Sandstone * *Organ Rock Formation * *Cedar Mesa Sandstone 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「White Rim Sandstone」の詳細全文を読む スポンサード リンク
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