Located near the petroglyphs of the Grimes Point National Recreational Trail, Picnic Cave’s tufa formations seem similar to the brain coral of an tropical reef. Unlike coral, the Picnic Cave formations were never alive. But they were once underwater. Ten thousand years ago, at the end of the last ice age, a vast lake covered much of the Great Basin. It’s possible today to see the horizontal lines in the rocks beneath the cave that show the prehistoric shorelines.

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