Page:The Journal of geology (IA journalofgeology311923univ).pdf/709

 THE JOURNAL OF GEOLOGY

November-December 1923

THE CHANNELED SCABLANDS OF THE COLUMBIA PLATEAU

J HARLEN BRETZ

University of Chicago

OUTLINE

Deposits Made by the Glacial Streams

Depths of Snake and Columbia Valleys during the Epoch

The Glaciation

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.

The largest areas of scabland are on the Columbia Plateau in Wash-