Cutler Formation: Difference between revisions

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[[Image:SEUtahStrat.JPG|thumb|300px|The [[Permian]] through [[Jurassic]] stratigraphy of the [[Colorado Plateau]] area of southeastern [[Utah]] that makes up much of the famous prominent rock formations in protected areas such as [[Capitol Reef National Park]] and [[Canyonlands National Park]]. 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 '''Cutler Formation''' or '''Cutler Group''' is a rock unit that is spread across the [[U.S. states]] of [[Arizona]], northwest [[New Mexico]], southeast [[Utah]] and southwest [[Colorado]]. It was laid down in the [[Permian|Early Permian]] during the [[Wolfcampian]] stage. In Arizona and Utah it is often called the '''Cutler Group''' but the preferred [[United States Geological Survey|USGS]] name is '''Cutler Formation'''.<ref>[ GEOLEX database entry for 'Cutler'] Accessed 18 March 2006</ref> Its subunits, therefore, are variously called formations or [[member (geology)|member]]s depending on the publication. This article will use the national standard set by the USGS. Members (youngest to oldest):
*Members (youngest to oldest):<ref>[ USGS GEOLEX database entry for 'Cutler'] Accessed 18 March 2006 (public domain text)</ref>
*[[De Chelly Sandstone]] (Arizona, Colorado, New Mexico, Utah)
*[[White Rim Sandstone]] (Utah)
== Extent ==
There is no designated [[Type locality (geology)|type locality]] for the Cutler. It was named by Cross and Howe in 1905 after Cutler Creek, which enters [[Uncompahgre River]] about 4 miles north of [[Ouray, Colorado]]. Baker and Reeside revised Cross and Howe's work in 1929 by dividing the formation into the Halgaito Tongue (base), Cedar Mesa Sandstone Member, Organ Rock Tongue, and White Rim Sandstone Member. Cutler's geographic extent was established by Wood and Northrop in 1946. In 1958 Wengerd and Matheny raised the formation to [[group (geology)|group]] rank, but {{As of|2005|lc=on}} the USGS does not recognize the suggested change.
[[File:Cedar Mesa Sandstone on top of Organ Rock Shale in Needles District of Canyonlands.jpeg|thumb|right|170px|Cedar Mesa Sandstone overlaying Organ Rock Shale, Canyonlands, Utah.]]
{{commons category|Cutler Formation}}
===Works cited===
*Cross, C.W. and Howe, Ernest, 1905, "Geography and general geology of the quadrangle, IN Description of the Silverton quadrangle [Colorado]", ''U.S. Geological Survey Geologic Atlas of the United States'', Silverton folio, no. 120, 34 p.
*Baker, A.A. and Reeside, J.B., Jr., 1929, "Correlation of the Permian of southern Utah, northern Arizona, northwestern New Mexico, and southwestern Colorado", American Association of Petroleum Geologists Bulletin, v. 13, no. 11, p.&nbsp;1413-1448
*Wood, G.H. and Northrop, S.A., 1946, "Geology of Nacimiento Mountains, San Pedro Mountain, and adjacent plateaus in parts of Sandoval and Rio Arriba Counties, New Mexico", U.S. Geological Survey Oil and Gas Investigations Map, OM-57, 1 sheet, scale 1:95,040
*Wengerd, S.A. and Matheny, M.L., 1958, "Pennsylvanian system of the Four Corners region", American Association of Petroleum Geologists Bulletin, v. 42, no. 9, p.&nbsp;2048-2106
*[ USGS GEOLEX database entry for 'Cutler'] Accessed 18 March 2006 (public domain text)
[[Category:Permian geologic formations]]