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| * Hadean Eon : 4.6 - 3.8 billion years ago (bya) | * Hadean Eon : 4.6 - 3.8 billion years ago (bya) | ||
| * 4.6 bya - Earth forms | * 4.6 bya - Earth forms | ||
| + | * 4.4 bya - Earth' | ||
| * 4 bya - Clouds, rain and oceans | * 4 bya - Clouds, rain and oceans | ||
| * Archean Eon : 3.8 - 2.5 bya | * Archean Eon : 3.8 - 2.5 bya | ||
| * 3.8 bya - first life on Earth | * 3.8 bya - first life on Earth | ||
| * 3.5 bya - photosynthesis starts | * 3.5 bya - photosynthesis starts | ||
| + | * 3.3 bya - 2.8 bya - Vaalbara supercontinent exists | ||
| * 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 bya - 800 mya - Rodinia supercontinent exists | ||
| + | * 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 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 | ||
| * 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 | ||