What is a sinkhole?
Nearly every state has rock layers of limestone, gypsum, and other soluble rocks we call 'karst'. Karst is important for many reasons. December 31, 2010. Karst features, Buffalo National River . Examples of karst features within the Buffalo National River Park. Karst is a type of topography that is formed over limestone, dolomite, or gypsum by dissolving or solution, and that is ...