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The Western Cascades subprovince, with only sparse smaller volcanoes active in the previous 4 million years, was spared the periodic infilling of its canyons by comprehensive volcanic deposits. Consequently, streams had been able to erode unabated, deepening and broadening their courses and continuing to create relief in the Western Cascades. In the western component of the United States, mountaineers often refer to the fourteeners, a collection of mountains more than…Read More