Cutler Formation: Difference between revisions

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| subunits = [[De Chelly Sandstone]], [[White Rim Sandstone]], [[Organ Rock Shale]], [[Cedar Mesa Sandstone]], [[Elephant Canyon Formation]], [[Halgaito Shale]]<ref name=GEOLEXNPS /><ref name=NPS2 />
| underlies = [[Chinle Formation]]
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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 [[ Wolfcamp Shale|Wolfcampian]] stage. Its subunits, therefore, are variously called formations or [[member (geology)|member]]s depending on the publication.
Members (youngest to oldest):<ref name=GEOLEXNPS >{{cite web|url=httphttps://ngmdbwww.usgsnps.gov/Geolexcany/NewUnitsplanyourvisit/unit_7824upload/geology.htmlpdf|title=CutlerGeology Groupof Canyonlands National Park|authorpublisher=<!--Not[[National stated-Park Service]], [[U.S. Department of the Interior]]|access-date=30 September 2018}}</ref><ref name=NPS2 >{{cite web|url=https://3dparks.wr.usgs.gov/coloradoplateau/canyondechelly_strat.htm|title=Stratigraphy of Canyon de Chelly National Monument|website=GEOLEXGeology of National Parks, database3D entryand forPhotographic 'Cutler'Tours|publisher=United States Geological Survey|access-date=1830 MarchSeptember 20062018|quote=}}</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]].<ref>Keroher, Grace C., {{cite webGoogle books|urllast=https://3dparks.wr.usgs.gov/coloradoplateau/lexicon/cutler.htm|title=Cutler GroupKeroher|authorfirst=<!--NotGrace stated-->C.|website=GeologyKssJAQAAIAAJ|Lexicon of NationalGeologic Parks,Names 3Dof andthe Photographic Tours|publisher=United States Geologicalfor Survey|access1936-date=301960, SeptemberPart 20181|page=1019|keywords=|text=|quoteplainurl=}}</ref> 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.
 
[[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.]]