Devils Postpile National Monument
Devils Postpile National Monument occupies a rectangle of land just 2.5 by 0.5 miles in extent, alongside the North Fork of the San Joaquin River in the central Sierra Nevada mountains. The river forms a powerful cascade (Rainbow Falls), and the surroundings are a typically beautiful Sierra combination of granite, forest and hills, but the main attraction is an outcrop of volcanic basalt composed of parallel, multi-sided columns, a relic of long ago eruptions from a nearby volcano.
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