NATIONAL PARK SERVICE · news
Rhyolite Erratic Floods Evidence
May 28, 2021 · Source: National Park Service
Ice Age Floods rafted a two-ton igneous rock not normally found in Oregon's Willamette Valley to Tualatin. It was discovered during excavation for the new Lakeridge Junior High School. The Rhyolite is mottled yellow, brown and greenish rock which likely came from the mountains of British Columbia, Canada or Montana.
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Traveler guidance by State & Nation Staff Writer.