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| * 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 Era : 550 - 250 mya | * Paleozoic Era : 550 - 250 mya | ||
| - | * Cambrian - small shelled animals, corals | ||
| - | * Ordovician - starfish, jawless fish | ||
| - | * Silurian - land plants, ferns, sharks, fish | ||
| - | * Devonian - first tetrapods (lizards) | ||
| - | * 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 Era : 250 - 65 mya | * 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 | ||