Portal de Periódicos da CAPES

ZION NATIONAL MONUMENT, UTAH

1947; Geological Society of America; Volume: 58; Issue: 3 Linguagem: Inglês

10.1130/0016-7606(1947)58[211

1943-2674

HERBERT E. WILLIAMS, NORMAN C. GREGORY,

Botany, Ecology, and Taxonomy Studies

Research Article| March 01, 1947 ZION NATIONAL MONUMENT, UTAH HERBERT E WILLIAMS; HERBERT E WILLIAMS BISHOP MUSEUM, HONOLULU, T. H.; 762 EIGHTH AVE., SALT LAKE CITY, UTAH. Search for other works by this author on: GSW Google Scholar NORMAN C GREGORY NORMAN C GREGORY BISHOP MUSEUM, HONOLULU, T. H.; 762 EIGHTH AVE., SALT LAKE CITY, UTAH. Search for other works by this author on: GSW Google Scholar GSA Bulletin (1947) 58 (3): 211–244. https://doi.org/10.1130/0016-7606(1947)58[211:ZNMU]2.0.CO;2 Article history received: 16 Mar 1944 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 HERBERT E WILLIAMS, NORMAN C GREGORY; ZION NATIONAL MONUMENT, UTAH. GSA Bulletin 1947;; 58 (3): 211–244. doi: https://doi.org/10.1130/0016-7606(1947)58[211:ZNMU]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Zion National Monument in Washington and Iron counties, southwestern Utah, includes approximately 5000 feet of sedimentary rocks, profoundly and intricately eroded; extrusive volcanics of two ages; and faults and folds of large displacement. The oldest sedimentary formation exposed is the Kaibab (Permian). Above it lie the Moenkopi, the Shinarump, and the Chinle formations of Triassic age; the Navajo sandstone, assigned to the Jurassic; and the Carmel formation and Entrada sandstone of known Jurassic age. The igneous rocks are basaltic cones and lavas. In the western part of the Monument the pre-Tertiary Kanarra fold has affected all the sedimentary rocks exposed. The fold was broken essentially parallel to its axis by the Hurricane fault, which in late Tertiary and Quaternary times disturbed the sedimentary rocks and most of the lava flows. Generally east of the area traversed by the Kanarra fold and the Hurricane fault the rocks are nearly horizontal; the displacement produced by faults is relatively slight. The physiographic history of the region is substantially that of the Colorado Plateau, of which the Monument is a part. Two major cycles of erosion are outlined, each initiated by faulting accompanied by regional uplifts. Conspicuous erosion features are deep, vertically walled canyons, remnant flat lands, surfaces cut across tilted rocks, hog-backs, and thick accumulations of gravel on canyon floors, now in process of vigorous removal. The region has no permanent inhabitants; it is a reserved scenic area in the midst of summer grazing lands. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.