Azurite blue formations in Lilburn Cave Photo courtesy of Bill Frantz. Cave formations in Hurricane Crawl Photo courtesy of Dave Bunnell. Cave Features. Cave formations (called “speleothems”) include long curtains, tall stalagmites, deep rimstone pools, masses of angular or curving growth forms called “helictites”, and 10-foot diameter shields. Park caves also display a diverse assemblage of colorful minerals. They form blue, green, yellow, black, white, orange, and red deposits and formations along walls, ceilings, and floors of caves. The parks’ caves include rooms 100 feet in diameter and tiny passages barely big enough for a small person to squeeze through. Some caves have active stream systems, while others are dry and abandoned remnants of ancient water-flow patterns.
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