Flood Basalt, Columbia River Gorge
Cascade Range and Columbia Plateau
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The great flood basalts of the Columbia Plateau are well exposed on the side of the Columbia River gorge in Washington across from The Dalles. In fact they are too well exposed, sitting far above the river where floodwaters never reach today. The next two pages show more details of this curious situation. (c) 2005 Andrew Alden, licensed to About.com, Inc. (fair use policy)
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