Bulletin of the National Speleological Society - ISSN 0146-9517
Volume 28 Number 2: 104-105 - April 1966

A publication of the National Speleological Society

Naturally Polished Pebbles from Black Hills Caves
Dwight E. Deal


"Cave pearls" that may have been naturally turmble polished are found in Bethlehem Cave and Jewel Cave, South Dakota. They are formed from fragments of limestone, calcite, other speleothems, and chert (?). Due to the questionable identificaiton of the chert fragments a solutional origin cannot completely be rules out.

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