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| * Proterozoic Eon : 2.5 bya - 550 mya | * Proterozoic Eon : 2.5 bya - 550 mya | ||
| * 2.4 bya - oxygen becomes significant component of the atmosphere | * 2.4 bya - oxygen becomes significant component of the atmosphere | ||
| - | * 1.8 - 1.5 bya - Columbia Supercontinent | ||
| * 1 bya - 800 mya - Rodinia supercontinent exists | * 1 bya - 800 mya - Rodinia supercontinent exists | ||
| * 770 - 750 mya - first ice age | * 770 - 750 mya - first ice age | ||
| * before 550mya is also known as the Precambrian Period or Supereon. After 550 mya is also known as the Phanerozoic Eon. | * before 550mya is also known as the Precambrian Period or Supereon. After 550 mya is also known as the Phanerozoic Eon. | ||
| - | * Paleozoic | + | * Paleozoic Era : 550 - 250 mya |
| - | * Cambrian - small shelled animals, corals | + | |
| - | * Ordovician - starfish, jawless fish | + | |
| - | * Silurian - land plants, ferns, sharks, fish | + | |
| - | * Devonian - first tetrapods - evolution of fish onto land | + | |
| - | * Carboniferous - reptiles, amphibians, spiders, confiers, synapsids | + | |
| - | * Permian - more synapsids (mammal-like reptiles) | + | |
| * 300 mya - 250 mya - last supercontinent Pangaea exists | * 300 mya - 250 mya - last supercontinent Pangaea exists | ||
| - | * Mesozoic | + | * Mesozoic Era : 250 - 65 mya |
| - | * Triassic - turtles, lizards, dinosaurs, mammals | + | |
| - | * Jurassic - squids, frogs, birds | + | |
| - | * Cretaceous - more dinosaurs, flowering plants, snakes, modern fish, toothed birds | + | |
| * Cenozoic Era : 65 mya - present | * Cenozoic Era : 65 mya - present | ||
| - | * Tertiary - more mammals, grasses, apes, hominids | ||
| - | * Quaternary | ||
| - | * Pleistocene (1.8 mya - 8000 ya) - mammoths, Neanderthals | ||
| - | * Holocene (8000 ya - now) - modern humans | ||