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Stratigraphic studies of the Triassic and associated formations were made in southeastern Utah and adjoining parts of Colorado and Arizona. Five principal lines of investigation were followed: regional stratigraphy, sedimentary petrology, pebble studies, sedimentary-structure studies, and lithofacies studies. The formations studied are the Cutler formation, Coconino sandstone, and Kaibab limestone of Permian age; the Moenkopi formation, Chinle formation, and Wingate sandstone of Triassic age; the Kayenta formation of Jurassic (?) age; and the Navajo sandstone of Jurassic and Jurassic (?) age. The Cutler formation grades from a conglomeratic facies in southwestern Colorado to a unit containing alternating reddish siltstone and yellowish-gray sandstone members in southeastern Utah. The reddish siltstone members comprise the Halgaito, Organ Rock, and Hoskinnini tongues. These alternate with the yellowish-gray sandstone members the Cedar Mesa, White Rim, and De Chelly sandstone members. The conglomeratic facies of the Cutler is classified as an arkose that was deposited by streams flowing westward from a rising granitic area in southwestern Colorado. The reddish siltstone members were deposited by quiet water in basins of accumulation on a slowly sinking continental margin, and they, also, were derived from a source area in southwestern Colorado. The Organ Rock tongue is part graywacke and part arkose, whereas the Hoskinnini tongue is arkose. The yellowish-gray sandstone members were deposited by winds blowing toward the southeast, and the materials probably were derived from a source area to the northwest. The Cedar Mesa sandstone member is feldspathic orthoquartzite, and the De Chelly sandstone member is tuffaceous feldspathic orthoquartzite. The Coconino sandstone and Kaibab limestone crop out in the western part of southeastern Utah. The Coconino is laterally equivalent to part of the Cutler formation and is an eolian deposit formed by southeastward-blowing winds. The Kaibab is a marine deposit. The Moenkopi formation of Triassic age consists of reddish horizontally and ripple-laminated siltstone that is classified as arkose and some cross-stratified sandstone of moderately well sorted sand that is classified as feldspathic orthoquartzite. The Sinbad limestone member crops out in central and southcentral Utah and to the south overlaps the underlying part of the Moenkopi.

Stratigraphy of Triassic and associated formations in part of the Colorado Plateau region