1866 (U.S. War Dept.) 214 By running into the river and out from it, these river ranges form plateau valleys, varying from a simple gorge to one or two miles in width.
1968 A. 30 The scarp..was formed during the Quaternary when the region underwent severe periglaciation with immense frost riving and modification of plateau valleys.
1994 D. R. Lewis ii. 26 Seed grasses, root plants, and sagebrush grow in the plateau valleys.