Eighty million years ago, what is today downtown Billings was the sea shore of the Western Interior Seaway that sprawled from the Arctic to the Gulf of Mexico. Through millions of years, sand and sediments were deposited at the shore, then compressed into the sandstone, eventually shaping into the formation we know today as the Rimrock, clearly visible above the city skyline. The Rimrocks are natural shelves with three trails, about 18 miles total, with more than 575 feet of elevation gain. Some trails are paved, and some are steep and run close to the edge of the cliff, requiring a great deal of care. The trails are regularly frequented by local mountain bikers. Popular among Billings' adventurous kids, "Devil's Kitchen" is a deep crack in the Rimrock, above 11th Avenue North, that ends in a cave.

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