Beginnings, Cenozoic Era (66 mya-Present), Eocene Epoch (56.0-33.9 mya), Evolution of Life (4600 mya-Present), Neogene Period (66-2.58 mya), Phanerozoic Eon (541 mya-Present) Beginnings, Evolution of Life: Eocene Epoch (56.0-33.9 mya), Modern Mammals November 19, 2024 — 0 Comments