Browse Items (3 total) Tags: Oligocene Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Turtle Very small shell. Good shape. Few of the marginal plates missing. Oligocene. Tags: Animals, Brown, Cenozoic, Fossils, Geology, North America, Oligocene, Paleogene, Paleontology, Reptiles, Tan, United States, Wyoming Coprolite Tags: Animals, Cenozoic, Fossils, Geology, North America, Oligocene, Paleogene, Paleontology, Tan, United States, Wyoming Leaf Fossil leaf imprint. Tags: Brown, Colorado, Eocene, Fossils, Geology, Miocene, North America, Oligocene, Paleocene, Plants, Pliocene, Tan, Tertiary, United States Featured Item Rattlesnake, Timber