The geological formations that compose this peculiar monument cover hundreds of square miles and preserve a diverse record of plant and animal life spanning more than 40 million years of the Age of Mammals. The national monument itself is divided into three units: Sheep Rock, Painted Hills, and Clarno—each of which looks vastly different and tells a different part of the story of Oregon's history. Each unit has picnic areas, restrooms, visitor information, and hiking trails. The main visitor center is in the Sheep Rock Unit, 40 miles northwest of John Day; Painted Hills and Clarno are about 70 and 115 miles northwest of John Day, respectively. If you only have time for one unit of the park, make it Painted Hills, where the namesake psychedelic mounds most vividly expose the region's unique geology.
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