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GEOLOGIC TIME SCALE, Time Units of the Geologic Time Scale, Eon, , Era, , Period, , Development of, Plants and Animals, , Epoch, Holocene, , Quaternary, , 0.01, , Pleistocene, , 1.6, , Cenozoic, , Tertiary, , 5.3, , Eocene, , Cretaceous, Jurassic, , 145, 208, , Triassic, , 33.7, , 65, , “Age, of, Reptiles”, , 248, , Carboniferous, , Palaeozoic, , 410, , Silurian, , Cambrian, , 438, 505, 545, , Vendian, 650, , First reptiles, Large coal swamps, Amphibians abundant, , 360, , Ordovician, , Archean Proterozoic, , “Age, of, Amphibians”, , Mississippian, , Devonian, , Extinction of dinosaurs, and many other species, First flowering plants, First birds, Dinosaurs dominant, First mammals, Extinction of trilobites and, many other marine animals, , 286, 320, , “Age of Mammals”, , 55, , Permian, Pennsylvanian, , Earliest hominids, , 23.8, , Oligocene, , Palaeocene, Mesozoic, , Phanerozoic, , Pliocene, Miocene, , Earliest Homo sapiens, , “Age, of, Fishes, “Age, of, Invertebrates”, “Soft-bodied, faunas”, , First amphibians, First insect fossils, Fishes dominant, First land plants, First fishes, Trilobites dominant, First organisms with shells, Abundant Ediacaran faunas, First multicelled organisms, , Collectively called, Precambrian, 2500, , 3800, , Hadean, 4600 Ma, , comprises, about 87% of the, geological time scale, , First one-celled organisms, Age of oldest rocks, Origin of the earth