Word: gypsum
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Dates: during 1930-1939
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Water filtering through overlaid rocks for perhaps 60 million years made Carlsbad Cave by dissolving original beds of rock salt, limestone, gypsum. In the great rooms, dripping water carrying, dissolved minerals has formed great stalagmites and stalactites. In the "King's Room" stalactites hang like the iridescent folds, pleats and ruffles of a canopy. The monstrosity of Carlsbad Cave, however, is the "Big Room," half a mile long, 400 ft. wide, 348 ft. high. Sixteen airships the size of the Los Angeles could be housed therein...