The first floor showcases large Ice Age mammals, including a mastodon uncovered by Shepard in 1869 and a mammoth found by Loomis in 1923. This floor also has an exhibit on the evolution of the horse in North America. The second floor holds a variety of invertebrates, trace fossils, minerals, and exhibits on local geology. Mounted specimens and pull-out drawers on both these floors are arranged to chronicle evolution and ecology. The basement houses the ichnology collection along with dinosaur skeletons.