This paper, describing the occurrence of glacial erratics in Willamette Valley of northwestern Oregon, is presented as a contribution toward the unraveling of the complex glacial history of the Columbia River basin. Not only may the data be useful to other workers, but the facts recited appear to furnish a basis for important Pleistocene correlations. The assistance furnished by a grant-in-aid from the National Research Council, covering part of the field expenses of this study, is gratefully acknowledged.
Willamette River, one of the major tributaries of lower Columbia River, occupies an open valley in northwestern Oregon between the Cascade Mountains on the east and the Coast Range on the west. Its expanded portion north of Eugene, Oregon, is about 125 miles long and at most places 15 to 30 miles or more wide. It receives the drainage of Coast and Middle forks from the south, of the . . .