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Where the Dangers Are Double

A special introduction to the gypsum karst landscapes of the Black Hills of South Dakota. This presentation highlights a recent set of trips into a couple gypsum sinkholes that were discovered when a neighborhood in Black Hawk, SD, started to fall into some rapidly forming karstic collapses. The presentation details the work of the Paha Sapa Grotto to explore and then map the sinkholes and caverns in this neighborhood.