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Willamette Valley The Willamette Valley province forms a catch basin between the Coast Range and the Cascades. The sediments collected into this basin record multiple Ice Age floods that originated in Montana, poured through the Cascades (via the Columbia River), and backed up in the valley before eventually draining to the Pacific Ocean. Silver Falls State Park, located on Highway 214 east of Salem: A 7-mile hiking trail takes you near or behind 10 waterfalls which cascade over steep cliffs of Columbia River basalt that flowed into this area as molten lava 14-16 million years ago. At North Falls, chimney-like holes in the overhanging rock are tree molds formed when hot lava flowed around and over standing trees. Link: Oregon Outdoors Travel Oregon Online - Willamette Valley Information Silver Falls State Park
Graphic by Elizabeth L. Orr, Geology of Oregon, |
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