James Magill, Allan Cox; Post-Oligocene tectonic rotation of the Oregon Western Cascade Range and the Klamath Mountains. Geology ; 9 (3): 127–131. doi: https://doi.org/10.1130/0091-7613(1981)9<127:PTROTO>2.0.CO;2
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Paleomagnetic data indicate that the Western Cascade Range from northern California to central Washington has undergone about 27° of clockwise rotation since 25 m.y. B.P. All the available regional paleo-magnetic data fit a two-phase rotation model, the first phase being an Eocene rotation that accompanied the accretion of the Oregon Coast Range to the continent and the second phase being a rotation associated with post–early Miocene extension in the Basin and Range province.