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Proterozoic (?) rocks in Utah

1940; Geological Society of America; Volume: 51; Issue: 6 Linguagem: Inglês

10.1130/gsab-51-795

1943-2674

A. J. Eardley, Robert A. Hatch,

Paleontology and Stratigraphy of Fossils

Research Article| June 01, 1940 Proterozoic (?) rocks in Utah A. J. EARDLEY; A. J. EARDLEY Search for other works by this author on: GSW Google Scholar R. A. HATCH R. A. HATCH Search for other works by this author on: GSW Google Scholar GSA Bulletin (1940) 51 (6): 795–843. https://doi.org/10.1130/GSAB-51-795 Article history received: 23 Jan 1940 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation A. J. EARDLEY, R. A. HATCH; Proterozoic (?) rocks in Utah. GSA Bulletin 1940;; 51 (6): 795–843. doi: https://doi.org/10.1130/GSAB-51-795 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract New sequences of supposedly Proterozoic strata are described on Promontory Point, Fremont Island, Antelope Island, Sheeprock Range, and the northern Wasatch Mountains. The Big Cottonwood Canyon sequence of Walcott is emended, and a fragmentary sequence in the west end of the Uintas is given. These and other sections already described are correlated insofar as possible and are related to known Cambrian strata overlying them and to the structural features of the region.The rocks were deposited in deep troughs in and between the northern Utah highland and the Colorado Plateau highland. Each trough was filled with sediments more than 12,000 feet thick. The beds are about half argillaceous and half arenaceous.The Fremont Island sequence contains a tillite 700 feet thick, and one 1100 feet thick occurs in the Sheeprock Range. Other tillites in the same and in other sections indicate repeated ice advances. The interbedded tillites and associated laminated argillites lead speculatively to the conclusion that the entire sequence of argillaceous, sandy, and tillitic strata may have been laid down during a glacial epoch.The age of the strata is either lower Cambrian, Proterozoic, or both. Study to date of the degree of metamorphism of Cambrian and underlying strata leads to no definite conclusion. Some deformation and erosion occurred before sands of Lower (?) Cambrian age were deposited, but in light of the highland and trough theory the angular unconformity around the highland margins may not be of great time significance. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.