geology of Southwestern Illinois
What’s Underneath? Karst: Rugged and Beautiful
An amazing underworld lies beneath our bluff lands. Our region’s distinctive geologic history literally laid the groundwork for the area’s unique subterranean landscape, a rugged, yet beautiful topography called “karst.” With the birth of the earth, processes began some 4 1/2 billion years ago, to build the globe’s crust and develop continents. Rocks and gravels […]