The Columbia Arc: New Evidence for Pre-Tertiary Rotation
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Research Article| September 01, 1969 The Columbia Arc: New Evidence for Pre-Tertiary Rotation W. R GREENWOOD; W. R GREENWOOD Geology and Geochemistry Branch, National Aeronautics and Space Administration Manned Spacecraft Center, Houston, Texas Search for other works by this author on: GSW Google Scholar R. R REID R. R REID Geology and Geochemistry Branch, National Aeronautics and Space Administration Manned Spacecraft Center, Houston, Texas Search for other works by this author on: GSW Google Scholar Author and Article Information W. R GREENWOOD Geology and Geochemistry Branch, National Aeronautics and Space Administration Manned Spacecraft Center, Houston, Texas R. R REID Geology and Geochemistry Branch, National Aeronautics and Space Administration Manned Spacecraft Center, Houston, Texas Publisher: Geological Society of America Received: 08 Jan 1969 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1969, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1969) 80 (9): 1797–1800. https://doi.org/10.1130/0016-7606(1969)80[1797:TCANEF]2.0.CO;2 Article history Received: 08 Jan 1969 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation W. R GREENWOOD, R. R REID; The Columbia Arc: New Evidence for Pre-Tertiary Rotation. GSA Bulletin 1969;; 80 (9): 1797–1800. doi: https://doi.org/10.1130/0016-7606(1969)80[1797:TCANEF]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 Structural analysis of two areas in central Idaho indicates the presence of large, steep-plunging sigmoidal folds. These structures bend schistosity and early fold axes, and one of the structures is cut by Cretaceous quartz monzonite of the Idaho batholith. A large, synkinematic orthogneiss body which intrudes the core of one of these folds has a weak schistosity parallel to the axial surface of the fold. The sigmoidal folds may be from latest Precambrian to early Cretaceous in age.These large sigmoidal folds are similar in style, attitude, and direction of tectonic transport to the much larger Cordilleran Orocline proposed by Carey (1958). The presence of the folds in central Idaho supports Carey's concept of translational rotation of the northwestern United States in response to deep crustal movements. 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.Keywords:
Geological survey
Center (category theory)