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Photo of white aragonite Photo of a pallid bat Photo of a lava tube (cave) entrance Photo of a shaft of light at the entrance of Carlsbad Cavern Photo of stalactites and soda straw speleothems Photo of someone looking toward the entrance of a cave Photo of stalagmites and aragonite speleothems
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Cave entrances are the interface between two vastly different worlds, that of bountiful food and rapid change on the surface, and the world of geologic timeframes and marginal subsistence below.
   
 
 
Cave and Karst Program
Geologic Resources Division
National Park Service
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Last Updated: November 18, 2002
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