Browse Items (2 total) Tags: Eocene Browse All Browse by Tag Search Items Sort by: Title Creator Date Added Fish Oil shale. Tags: Animals, Black, Bony Fish, Brown, Cenozoic, Eocene, Fish, Fossils, Geology, North America, Paleogene, 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 Dinosaur (Arkansaurus fridayi) Cast of Arkansaurus fridayi right hind leg.