Stratigraphic range: Permian
|Sub-units||Harding Point Sandstone Member, Cave Spring Sandstone|
|Underlies||Kaibab Limestone, Toroweap Formation|
|Named for||Coconino Plateau|
|Named by||N. H. Darton, 1910|
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.
This rock formation is particularly prominent in southeastern Utah, where it can be seen in a number of national parks and monuments, including Zion National Park, Capitol Reef National Park, the San Rafael Swell, and Canyonlands National Park. It is also present in the Grand Canyon, where it is visible as a prominent white cliff forming layer. The thickness of the formation varies due to regional structural features, in the Grand Canyon area it is only 65 ft thick in the west, thickens to over 600 ft in the middle and then thins to 57 ft in the east. Either the Kaibab Limestone or Toroweap Formation overlies the Coconino Sandstone. The Coconino Sandstone is typically buff to white in color. It consists primarily of fine well sorted quartz grains, with minor amounts of potassium feldspar grains deposited by eolian processes (wind-deposited) approximately 260 million years ago. Several structural features such as ripple marks, sand dune deposits, rain patches, slump marks, and fossil tracks are not only well preserved within the formation but, they also contribute evidence of its eolian origin.
Lechatelierite (silica glass), as well as coesite and stishovite (high pressure forms of SiO2) were formed during the impact of a meteorite into the Coconino Sandstone at Barringer Crater in Arizona.
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- Darton, N.H. (1910) A reconnaissance of parts of northwestern New Mexico and northern Arizona. Bulletin 435. U.S. Geological Survey, Reston, Virginia. 88 p., (incl. geologic map, scale 1:1,000,000)
- McKee, E.D. (1945) Small-scale structures in the Coconino Sandstone of northern Arizona." The Journal of Geology. 53(5):313-325.
- McKee, E.D. (1979) A study of global sand seas. Professional Paper 1052. U.S. Geological Survey, Reston, Virginia. 429 pp.
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- Kieffer, S.W. (1971) I, Shock Metamorphism of the Coconino Sandstone at Meteor Crater, Arizona; II, The Specific Heat of Solids of Geophysical Interest. Unpublished PhD. dissertation. Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California. 253 pp.
- Anonymous (nd) Coconino Formation, Geological Formations−Records of the Past, West Coast Regional Carbon Sequestration Partnership (WESTCARB).
- Thayer, D. (nd) Coconino Sandstone, Canyon Dave Tours, Flagstaff, Arizona.
- U.S. Geological Survey (2011) Coconino Sandstone, Stratigraphy of the Parks of the Colorado Plateau, U.S. Department of the Interior, Denver, Colorado.