Lehman Caves in Great Basin National Park - …
Apr 19, 2021 · So, Lehman Caves in Great Basin National Park were formed from an ancient sea spread across Nevada and Utah 550 million years ago. The calcium formations and sediment came from the sea creatures who called this sea their home. Over millions of years, the sediment was exposed to the elements, rising and falling, dripping through cracks in the caves.
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