Map modified from: Snavely, Parke D., Jr. and Holly C. Wagner. 1963. Tertiary Geologic History of Western Oregon and Washington, Rept. of Investig. No. 22. Div. of Mines and Geology, Dept of Conservation, State of Washington. pp 1-25.
Map modified from: Snavely, Parke D., Jr. and Holly C. Wagner. 1963. Tertiary Geologic History of Western Oregon and Washington, Rept. of Investig. No. 22. Div. of Mines and Geology, Dept of Conservation, State of Washington. pp 1-25.