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.
Copi.
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