Vertebrate Paleontology and Ichnofossils - Collections Vertebrates Most of our vertebrate fossils were collected from the Laramide basins of the Rocky Mountains, with exceptional collections of Paleocene, Eocene, Oligocene and Miocene age. The Denver, "Wasatch," Willwood, Huerfano, Bridger, Wind River, DeBeque, Troublesome, and White River formations are especially well represented. Other important vertebrate collections include neogene vertebrates of North and South Africa, and Cretaceous microvertebrates and marine reptiles from the Western Interior of North America. Since 1961, our field projects have included an emphasis on thorough stratigraphic documentation. Ichnofossils (trace fossils) and fossil eggshells Our ichnofossil collection features a variety of vertebrate and invertebrate trace fossils from different geologic time periods and formations. The ichnofossil collections feature a diverse and actively growing collection of coprolites (fossil feces)! The museum also houses the Karl Hirsch eggshell collection, which is one of the largest fossil eggshell collections in the world, and is unique with its associated thin sections and photomicrographs.