Browse Items (1 total) Tags: Tertiary Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Leaf Fossil leaf imprint. Tags: Brown, Colorado, Eocene, Fossils, Geology, Miocene, North America, Oligocene, Paleocene, Plants, Pliocene, Tan, Tertiary, United States Featured Item Dinosaur Cast containing the 4th metatarsal of the right hind foot.