The Lehman Caves is a major attraction in Great Basin National Park. It system is composed of beautiful marble caverns that offers outstanding opportunity to view and study cave features including stalactites, stalagmites, helictites, flowstone and popcorn. The caverns contain over 300 shield formations, which are rare in other caves.
The Lehman Cave system began forming approximately 550 million years ago (during the Cambrian) while it was still submerged in a relatively warm, shallow ocean. The caves are made up of a marble and limestone solution, for the most part, that forms the many cave decorations throughout the caverns.
The cave system became much deeper during the Pleistocene, when a prolonged and increased flow of water eroded through the cave's fracturing bedrock. Eventually, the water level dropped, leaving glare rooms and cavities in the rock, creating the depths of the Lehman Caves system.