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. Layered with sandstone and shale, the limestone preserves fossils, dissolves along fractures, traps natural gas, and is the source of famous building stones. Roadside Geology of Indiana explores the geologic features visible along the state"s highways from Indiana Dunes National Lakeshore in the north to Wyandotte Caves in the south. As you travel across Indiana"s time-worn topography, discover fossilized reefs, mastodon skeletons, geodes, ancient bedrock valleys, and the site of a mysterious meteorite impact. Authors Mark J. Camp and Graham T. Richardson divide Indiana into four geographically distinct regions: the arched limestones of the southeastern hills, the karst topography of the south, the coal-bearing rocks of the Wabash lowlands, and the glacially buried north. Numerous maps and cross sections reveal Indiana"s geology for easy exploration.