Geologic studies of the Columbia Plateau: Part II. Upper Miocene basalt distribution, reflecting source locations, tectonism, and drainage history in the Clearwater embayment, Idaho

Research Article| September 01, 1981 Geologic studies of the Columbia Plateau: Part II. Upper Miocene basalt distribution, reflecting source locations, tectonism, and drainage history in the Clearwater embayment, Idaho V. E. CAMP V. E. CAMP 1c/o Directorate General of Mineral Resources, P.O. Box 5219, Jeddah, Saudi Arabia Search for other works by this author on: GSW Google Scholar Author and Article Information V. E. CAMP 1c/o Directorate General of Mineral Resources, P.O. Box 5219, Jeddah, Saudi Arabia Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1981) 92 (9): 669–678. https://doi.org/10.1130/0016-7606(1981)92<669:GSOTCP>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation V. E. CAMP; Geologic studies of the Columbia Plateau: Part II. Upper Miocene basalt distribution, reflecting source locations, tectonism, and drainage history in the Clearwater embayment, Idaho. GSA Bulletin 1981;; 92 (9): 669–678. doi: https://doi.org/10.1130/0016-7606(1981)92<669:GSOTCP>2.0.CO;2 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 The Clearwater embayment of western Idaho represents the easternmost encroachment of Columbia River Basalt against the western side of the Rocky Mountains. Several new units of the Columbia River Basalt Group have been identified in the embayment, and the distribution of these, and other previously recognized flows, reflects (1) the location of vents, feeder dikes; and source areas from which the flows were erupted; (2) tectonic events during the eruptive episode, and (3) the development of erosional channels that were filled subsequently by successive flows.The Lewiston and Stites basins were filled by Wanapum and Saddle Mountains flows erupted in the North Fork of the Clearwater River area. Flows poured into the Stites basin from surrounding plateau surfaces, but they spread into the Lewiston basin after advancing down ancestral Clearwater River canyons. As an ancestral Clearwater River would lose its canyon to an invading flow, water would spill onto the low-lying areas of the Lewiston basin and deposit sediment. This event was repeated several times and resulted in a sequence of alternating flows and intercalated sediment in the Lewiston basin. 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.