Illinois--a flat and boring state with nothing but cornfields and crowded expressways, right? Balderdash! Geology Underfoot in Illinois scratches the Prairie State's surface to expose geologic diversity that stretches back more than a billion years. Copious illustrations and witty, page-turning prose guide readers on geologic walking or driving tours of 37 sites in Illinois. Enjoy an unexpected exploration of Chicago's architectural geology. Embark on a fault-seeking expedition in Mark Twain's big-river country. Or try moraine surfing on Interstates 55 and 74. With a touch of curiosity and Geology Underfoot in Illinois in hand, you will view the state with a new sense of wonder.