Iowa's rock record is the product of more than three billion years of geological processes. The state endured multiple episodes of continental glaciation during

The Fossils of Iowa field guide is written primarily for amateurs in geological exploration and collecting. Robert Wolf provides a comprehensive coverage of mor

The burnt-red badlands of Montana's Hell Creek are a vast graveyard of the Cretaceous dinosaurs that lived 68 million years ago. Those hills were, much later, a