Foothills-Wallowa #37 in the Western Cordillera

Foothills-Wallowa

Basement domain in the Western Cordillera

Geologic information

Region	Western Cordillera
Crust	Type: Oceanic arc Formation age: 280-165 Ma
Accretion	Type: Collisional Age: 135 Ma
Notes	Basement to arc as old as 300 Ma in Klamath Mtns (Saleeby, 1982)

Geographic extent

Amador, Butte, Calaveras, Del Norte, El Dorado, Fresno, Kern, Kings, Madera, Mariposa, Merced, Nevada, Placer, Plumas, Sacramento, Shasta, Sierra, Siskiyou, Stanislaus, Tehama, Trinity, Tulare, Tuolumne, Yuba, Adams, Clearwater, Idaho, Lewis, Nez Perce, Baker, Crook, Curry, Deschutes, Douglas, Gilliam, Jackson, Jefferson, Josephine, Klamath, Lane, Linn, Marion, Morrow, Sherman, Umatilla, Union, Wallowa, Wasco, Wheeler, Asotin, Columbia, Garfield, Klickitat, Walla Walla, Whitman

Bibliographic references

Vallier, T.L., 1995, Petrology of pre-Tertiary igneous rocks in the Blue Mountains region of Oregon, Idaho, and Washington: Implications for the geologic evolution of a complex island arc, in Vallier, T.L., and Brooks, H.C., eds., Geology of the Blue Mountains region of Oregon, Idaho, and Washington—Petrology and tectonic evolution of pre-Tertiary Rocks of the Blue Mountains region: U.S. Geological Survey Professional Paper 1438, p. 125–209.Dickinson, W.R., 2008, Accretionary Mesozoic-Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon: Geosphere, v. 4, p. 329–353.Dorsey, R.J., and LaMaskin, T.A., 2007, Stratigraphic record of Triassic-Jurassic collisional tectonics in the Blue Mountains Province, northeastern Oregon: American Journal of Science, v. 307, p. 1167–1193.Ernst, W.G., Snow, C.A., and Scherer, H.H., 2008, Mesozoic transpression, transtension, subduction and metallogenesis in northern and central California: Terra Nova, 20, p. 394–413.