Ralph Haugerud, USGS
The Geologic History of San Juan Island


R. Tabor and R. Haugerud, 1999, Geology of the North Cascades: a
Mountain Mosaic, The Mountaineers

R. Haugerud, 2004, Cascadia--Physiography: U.S. Geological
Survey, Geologic Investigations Series I-2689, scale 1:2,000,000

W.H. Mathews and J.W.H. Monger, 2005, Roadside geology of
southern British Columbia, Mountain Press

North Cascades Geology web site: http://geology.wr.usgs.gov/parks/noca/

Geologic Guide to Olympic National Park: http://wrgis.wr.usgs.gov/parks/olym/

Washington Division of Geology and Earth Resources: http://www.dnr.wa.gov/geology/

GeoMapNW: http://geomapnw.ess.washington.edu

Pacific Northwest geologic mapping and urban hazards: http://geomas.wr.usgs.gov/pacnw/