Full Title: Paleozoic and Mesozoic Rocks of Gros Ventre, Teton, Hoback, and Snake River Ranges, Wyoming
Authors: Harold R. Wanless, Ralph L. Belknap, and Helen Foster
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The Gros Ventre, southern Teton, northern Hoback, and Snake River ranges and Grayback Ridge of the Wyoming Range, and the buttes of southern Jackson Hole display a remarkably long and nearly complete stratigraphic column. Archean granites and gneisses are strikingly displayed in the eastern fault scarp and high peaks of the Teton Range and the southeast front of the Gros Ventre Range. Paleozoic rocks, representing all periods with the possible exception of the Silurian, aggregate about 6000 feet, and the Triassic, Jurassic, and Cretaceous are represented by more than 12,000 feet of strata. The Paleocene and Eocene are represented by a maximum of about 20,000 feet in the Hoback basin between the Hoback and Gros Ventre ranges, and in the Mt. Leidy highlands north of the Gros Ventre ranges and east of Jackson Hole. The Oligocene is apparently unrepresented except farther north in Jackson Hole, but the Miocene and early Pliocene are represented by the Camp Davis formation several thousand feet thick in Bryan Flats between Hoback Range and Grayback Ridge, in Jackson Hole, and in Star, Grand, and Swan valleys west of the Snake River Range. Volcanic rocks of Tertiary age are intercalated with the sediments in Jackson Hole and Grand and Star valleys, and there are late Tertiary intrusives in the Snake River Range. The Pleistocene is recorded by the Buffalo, Bull Lake, and Pinedale drifts of Kansan, Iowan and Mankato ages.
Published: 7/14/1955
Pages: 90
Product Category: Memoirs