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Geologists believe that the unique formation found in Wind Cave called boxwork, predates the cave. The cave is formed in limestone and geologists believe that
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Document Date: 2012-09-25 19:37:30
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File Size: 3,48 MB
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Black Hills
Frostwork
South Dakota
Boxwork
Wind Cave National Park
Cave
Limestone
Abukuma-do
Jewel Cave National Monument
Speleothems