Bulletin of the Geological Society of America . .-j;*ft J30. 580 j. h. bretz—glacial drainage ox columbia plateau Glaciation Probably the entire highland area north of the plateau was Imried be-neath the Cordilleran ice-sheet during the Pleistocene giaciations. Atleast three times the Cordilleran ice forced a crossing of the ColumbiaValley and advanced onto the plateau. The latest of these, of Wisconsinage, has been described; the earlier ones thus far have been but noted inthe literature. Farther east, where Spokane Eiver serves as the bound-ary, only two glacial invasions of the plateau are
Bulletin of the Geological Society of America . .-j;*ft J30. 580 j. h. bretz—glacial drainage ox columbia plateau Glaciation Probably the entire highland area north of the plateau was Imried be-neath the Cordilleran ice-sheet during the Pleistocene giaciations. Atleast three times the Cordilleran ice forced a crossing of the ColumbiaValley and advanced onto the plateau. The latest of these, of Wisconsinage, has been described; the earlier ones thus far have been but noted inthe literature. Farther east, where Spokane Eiver serves as the bound-ary, only two glacial invasions of the plateau are known, both of whichare pre-Wisconsin, and only brief notes exist regarding Thelatter of these two giaciations is well recorded in the topography. Withit and the Wisconsin glaciation on the northwestern part of the plateauthis paper chiefly deals. The Spokane Glaciationgeneral statement Observers for years have been noting the existence of granite bouldersscattered over the basalt plateau of Washington far beyond the limitsreached by the Wisconsin
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
