Before history, Cenozoic Era (66 mya-present), Evolution of Life (4560 mya-present), Neogene Period (66-2.8 mya), Phanerozoic Eon (541 mya-present) Before History, Evolution of Life: Eocene Epoch (56.0-33.9 mya), Modern Mammals November 19, 2024 — 0 Comments