Cutler Formation: Difference between revisions

correction, and added photo from Commons
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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''' 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>[http://ngmdb.usgs.gov/Geolex/NewUnits/unit_7824.html 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 [age sorting needs to be checked]):
*De Chelly Sandstone (Arizona, Colorado, New Mexico, Utah)
*White Rim Sandstone (Utah)
*Organ Rock Shale (Arizona, Colorado, New Mexico, Utah)
*[[Cedar Mesa Sandstone]] (Arizona, Utah)
*Halgaito (Arizona, Colorado, New Mexico, Utah)
*Elephant Canyon (Utah)
*Halgaito (Arizona, Colorado, New Mexico, Utah)
*[[Cedar Mesa Sandstone]] (Arizona, Utah)
*Organ Rock Shale (Arizona, Colorado, New Mexico, Utah)
*White Rim Sandstone (Utah)
*De Chelly Sandstone (Arizona, Colorado, New Mexico, Utah)
 
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.]]
 
Cutler outcrops are found in these geologic locations: