Prairie emigrants used covered farm wagons like this (but not heavy boat-shaped Conestoga wagons), on display at Chimney Rock National Historic Site, Bayard, Nebraska, USA. At Chimney Rock, a slender rock spire rises 325 feet from a conical base, serving as an impressive natural landmark along the Oregon Trail, the California Trail, and the Mormon Trail during the mid-1800s. 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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