The natural landmark of Chimney Rock was frequently acclaimed in mid-1800s diaries on the Oregon Trail, California Trail, and Mormon Trail. At Chimney Rock National Historic Site in Nebraska, a slender rock spire rises 325 feet from a conical base. Modern travelers can see it along U.S. Route 26 and Nebraska Highway 92. At 4228 feet above sea level, the distinctive formation towers 480 feet above the adjacent North Platte River Valley. Its layers of volcanic ash and brule clay date to the Oligocene Age (34 million to 23 million years ago).
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