Learn about the stories minerals, rocks, and fossils tell us about the history of the Earth. Sections discussing the Precambrian Era, the Paleozoic Era, the Mesozoic Era, the Cenozoic Era and the present landscape of Iowa are included as well.
Iowa Association of Naturalists
Iowa Association of Naturalists, "Iowa Geology and Fossils -- Iowa Physical Environment Series" (1999). Iowa Naturalist Association Publications. 2.