Located 18 miles west of the small eastern Oregon town of Fossil, the Palisades of the Clarno Unit of John Day Fossil Beds National Monument look like petrified castle battlements but are actually remnants of lahars (volcanic ash and mudflows) that sailed down the flanks of an ancient volcano, mowing down any plant or mammal in the way..
Looking toward the Palisades in the Clarno Unit of John Day Fossil Beds National Monument
Rebecca Latson
Thursday, April 16, 2020
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