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The Chetco River flows through the ancient Klamath Mountain terrane, which is between 400 and 100 million years old, the oldest rocks in Oregon.^[26] The Klamath microcontinent was originally located beneath the ocean near southern California before separating hundreds of millions of years ago.^[27] Plate tectonics pushed the microcontinent north, and bits of granite, sea floor sediment, subduction zones, and coral reefs gradually accreted into small islands.^[26][27] Between 212 and 170 million years agocrisis intervention
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