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Cascadia

Basement domain in the Western Cordillera

Geologic information

Region Western Cordillera
Crust
Formation age: 50-0 Ma
Accretion
Type: Underthrusting
Age: 50-0 Ma
Notes Some authors (Brandon and others, 1998) suggest onset of accretion at 35 Ma

Geographic extent

Clatsop, Coos, Curry, Clallam, Grays Harbor, Jefferson, Mason, Pacific

Bibliographic references

Tréhu, A.M., Asudeh, I., Brocher, T.M., Luetgert, J.H., Mooney, W.D., Nabelek, J.L., and Nakamura, Y., 1994, Crustal architecture of the Cascadia forearc: Science, New Series, v. 266, no. 5183, p. 237–243.Tréhu, A.M., Blakely, R.J., and Williams, M.C., 2012, Subducted seamounts and recent earthquakes beneath the central Cascadia forearc: Geology, v. 40, p. 103–106.Stewart, R.J., and Brandon, M.T., 2004, Detrital-zircon fission-track ages for the 'Hoh Formation'—Implications for late Cenozoic evolution of the Cascadia subduction wedge: Geological Society of America Bulletin, v. 116, p. 60–75.