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Comments on Gigapan: Siskiyou Pass Volcaniclastic Deposits

  2. Road cuts on Syskiyou Summit on Interstate 5 a few miles north of the California-Oregon border beautifully expose the volcaniclastic Colestin formation. The Colestin formation is early Oligocene (~34-28 Ma) in age and represents volcanic and depositional events closely following the initiation of Cascade volcanism. Clo...

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