Untouched cave to provide clues to Black Hills history – Omaha World-Herald

Untouched cave to provide clues to Black Hills history
Omaha World-Herald
SIOUX FALLS, S.D. (AP) — The National Park Service is beginning to excavate the mouth of an unexplored cave in the Black Hills of South Dakota, and researchers believe it could help broaden our understanding of how the region's climate has changed …

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