Mapping at 1:250,000 scale was produced by combining and simplifying completed 1:100,000-scale geologic mapping to produce four maps, one for each quadrant of Washington. With the 2002 release of the full-color printed geologic map of the state’s northwest quadrant, all four quadrant maps are now available from the Geology and Earth Resources Division.
- Geologic Map 34: Geologic Map of Washington--Southwest Quadrant (1987)
- Geologic Map 39: Geologic Map of Washington--Northeast Quadrant (1991)
- Geologic Map 45: Geologic Map of Washington--Southeast Quadrant (1997)
- Geologic Map 50: Geologic Map of Washington--Northwest Quadrant (2002)
To order these and other publications of the Geology and Earth Resources Division, please visit our Publications page.