NATURE · HISTORICAL MARKER

Salmon River Canyon

Idaho County
· Some 15 million years ago, Salmon River ran across great Miocene lava flows
Nature
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This part of the earth’s surface gradually rose, and as the mountains were rising, the river cut down into the older rock below. Many other northwestern rivers cut similar gorges. The Snake flows through Hell’s Canyon, the deepest of them all, 8 miles west of here.
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Idaho · United States
Idaho County
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