Hundreds of millions of years ago, warm, coral—rich seas deposited mud on the ocean floor, and in time it became limestone—the cornerstone of Indiana geology. From the fossil—studded rocks and twisting caverns of the southern hills to the coal seams of the Wabash Valley and the shifting sands of the glacial plains, Roadside Geology of Indiana provides a window to a vibrant and dynamic past. With this book as your guide, tour Indiana's timeworn topography and discover fossilized reefs, mastodon skeletons, geodes, buried bedrock valleys, and the site of a meteorite impact.