Geology of the Harney Basin, Briefly

During the middle to late Miocene epoch (approximately 8-12 million years ago), a series of volcanic eruptions poured Columbia River flood basalts across the Pacific Northwest, covering portions of southern Washington, western Idaho, and northern and eastern Oregon with extensive lava flows.

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Basin and Range Topography

Written by Peter Pearsall/Photo by Peter Pearsall “The mountains form a ribbon of familiar landscape separating two vast spaces, blue haze above, a mosaic of cracked mud below. The desert

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