GEOMORPHOLOGY OF SOUTH-CENTRAL WASHINGTON, ILLUSTRATED BY THE YAKIMA EAST QUADRANGLE

Abstract

Research Article| June 01, 1955 GEOMORPHOLOGY OF SOUTH-CENTRAL WASHINGTON, ILLUSTRATED BY THE YAKIMA EAST QUADRANGLE AARON C WATERS AARON C WATERS THE JOHNS HOPKINS UNIVERSITY, BALTIMORE 18, MARYLAND Search for other works by this author on: GSW Google Scholar Author and Article Information AARON C WATERS THE JOHNS HOPKINS UNIVERSITY, BALTIMORE 18, MARYLAND Publisher: Geological Society of America Received: 05 Apr 1954 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1955, 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 (1955) 66 (6): 663–684. https://doi.org/10.1130/0016-7606(1955)66[663:GOSWIB]2.0.CO;2 Article history Received: 05 Apr 1954 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation AARON C WATERS; GEOMORPHOLOGY OF SOUTH-CENTRAL WASHINGTON, ILLUSTRATED BY THE YAKIMA EAST QUADRANGLE. GSA Bulletin 1955;; 66 (6): 663–684. doi: https://doi.org/10.1130/0016-7606(1955)66[663:GOSWIB]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 Geologic mapping of the Yakima district has been neglected since publication of the Ellensburg and Mount Stuart folios (G. O. Smith, 1903a; 1904; see also Calkins, 1905). Reports on other parts of the Columbia River plateau, however, pose new problems and call for revision of some interpretations. This paper presents the results of extending Smith's mapping eastward into the adjacent Yakima East quadrangle, and of considerable reconnaissance work in adjoining areas. The new mapping shows that to the east and south the lower part of the Ellensburg formation interfingers with the Yakima basalt. It also indicates that local diastrophism and volcanism continuously modified and interrupted deposition of the Ellensburg formation.Smith's conclusions that the great topographic ridges are growing anticlines, not fault blocks, and that the major rivers are antecedent to these folds, are confirmed. The anticlines appear to have grown in a single epoch of deformation instead of in two orogenic episodes separated by a period of peneplanation. The “Cascade lowland” is a local pediment formed on the flanks of a growing anticline, not a remnant of a widespread peneplain.The new data do not support Warren's hypothesis of defeat and diversion of Columbia River by rise of the Horse Heaven uplift, nor Flint's hypothesis of the cutting of Wallula Gap by a river thus diverted. 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.