Map of the Columbia River Basalt flood province across Oregon and Washington

Oregon Geology: The Coastal Range and Cascade Mountains

Oregon Wine History / , , ,

Fire, sea, wind, and flood: four very different forces, acting across 15 million years, built the ground beneath Willamette Valley wine — and decided where the vines could grow. KWReviewed & edited by Ken Wytsma · Fact-checked June 2026Researched and fact-checked against independent sources, with AI assistance.✓ Verified Every great wine region is, underneath, a

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