At over 152 miles, Jewel Cave is the second longest cave in the world and is known for it's extensive display of calcite crystals and other rare formations.  Art Palmer tells the geologic story of Jewel Cave in terms anyone can understand, but technically enough to be of interest to professionals.  Informative tables, charts, and interesting photography along with Palmer's easy reading text make this book a wonderful addition to the library of anyone interested in caves or geology.