What can a land formation (ex. cave, stalagmite) tell us about the past? How can a place shift and change with time? Objective Students will determine how erosion occurs in karst landscapes and how caves and other landforms are formed in this environment. Background It is important to learn about karst landscapes within Buffalo National River because Arkansas has one of the largest karst networks in the Midwest United States. The geologic processes in this area form caves, sinkholes, springs, and disappearing streams. Buffalo National River has all of these in various areas of the park. Prepar Duration: 60 Minutes.