Cutler Formation

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 Early Permian during the Wolfcampian stage. Its subunits, therefore, are variously called formations or members depending on the publication. Members (youngest to oldest):[1]

Extent

There is no designated 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 rank.

Cedar Mesa Sandstone overlaying Organ Rock Shale, Canyonlands, Utah.

Geology

Cutler outcrops are found in these geologic locations in Arizona, Colorado, New Mexico and Utah.

References

  1. ↑ GEOLEX database entry for 'Cutler' Accessed 18 March 2006
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