The Channeled Scablands of the Columbia Plateau Author(s): J. Harlen Bretz Source: The Journal of Geology, Vol. 31, No. 8 (Nov. - Dec., 1923), pp. 617-649 Published by: The University of Chicago Press Stable URL: http://www.jstor.org/stable/30066357 . Accessed: 16/01/2015 14:23 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp . JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact
[email protected]. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Geology. http://www.jstor.org This content downloaded from 128.193.213.194 on Fri, 16 Jan 2015 14:23:28 PM All use subject to JSTOR Terms and Conditions VOLUME XXXI NUMBER 8 THE JOURNAL oF GEOLOGY November-December 1923 THE CHANNELED SCABLANDS OF THE COLUMBIA PLATEAU J HARLEN BRETZ University of Chicago OUTLINE DEFINITION OF " SCABLAND" PHYSIOGRAPHIC RELATIONS OF THE CHANNELED SCABLANDS GENERALIZED STATEMENT OF THE ORIGIN OF THE CHANNELED SCABLANDS THE BASALT PLAIN, NORTH OF THE SCABLANDS AND THE MATURE TOPOGRAPHY THE MATURE TOPOGRAPHY DETAILS OF A SCABLAND SURFACE ALTITUDES AND GRADIENTS OF THE SCABLAND TRACTS DEPTH OF GLACIAL STREAM EROSION IN THE SCABLANDS Criteria Instances VOLUME OF THE GLACIAL STREAMS DEPOSITS MADE BY THE GLACIAL STREAMS DEPTHS OF SNAKE AND COLUMBIA VALLEYS DURING THE EPOCH THE GLACIATION DEFINITION OF " SCABLAND" The terms "scabland" and "scabrock" are used in the Pacific Northwest to describe areas where denudation has removed or prevented the accumulation of a mantle of soil, and the underlying rock is exposed or covered largely with its own coarse, angular debris.