The South-Central Kentucky karst is a crossroad of carbonate bedrock stretching north to Indiana, east to the Cumberland Plateau, south to Georgia and west to the Ozarks. The park is bisected east to west by the Green River, which defines the hydrologic base-level and divides the region into two distinct physiographic areas. North of the river an alternating series of limestones and insoluble rocks are exposed with the main limestone strata accessible only near the river and in the bottom of a few deeply incised valleys.
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