notes:history
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notes:history [2026/06/07 01:41] 116.88.223.6 old revision restored (2026/06/05 08:41) |
notes:history [2026/06/07 18:30] (current) 78.154.231.253 old revision restored (2008/11/18 01:18) |
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| * 2.4 bya - oxygen becomes significant component of the atmosphere | * 2.4 bya - oxygen becomes significant component of the atmosphere | ||
| * 1 bya - multicellular plants (algae) and animals | * 1 bya - multicellular plants (algae) and animals | ||
| + | * 1 bya - 800 mya - Rodinia supercontinent exists | ||
| * 770 - 750 mya - first ice age | * 770 - 750 mya - first ice age | ||
| * before 550 mya is aka the Precambrian Period or Supereon. After 550 mya is aka the Phanerozoic Eon. | * before 550 mya is aka the Precambrian Period or Supereon. After 550 mya is aka the Phanerozoic Eon. | ||
| - | | + | * Paleozoic (Primary) Era : 550 - 250 mya |
| * Cambrian - small shelled animals, corals | * Cambrian - small shelled animals, corals | ||
| * Ordovician - starfish, jawless fish | * Ordovician - starfish, jawless fish | ||
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| * 250 mya - Extinction event, 95% of life dies off | * 250 mya - Extinction event, 95% of life dies off | ||
| * 300 mya - 250 mya - last supercontinent Pangaea exists | * 300 mya - 250 mya - last supercontinent Pangaea exists | ||
| - | | + | * Mesozoic (Secondary) Era : 250 - 65 mya |
| * Triassic - turtles, lizards, dinosaurs, mammals | * Triassic - turtles, lizards, dinosaurs, mammals | ||
| * Jurassic - squids, frogs, birds | * Jurassic - squids, frogs, birds | ||
| * Cretaceous - more dinosaurs, flowering plants, snakes, modern fish, toothed birds | * Cretaceous - more dinosaurs, flowering plants, snakes, modern fish, toothed birds | ||
| * 65 mya - Meterorite extinction event (off Yucatan peninsula) kills off most large animals | * 65 mya - Meterorite extinction event (off Yucatan peninsula) kills off most large animals | ||
| - | | + | * Cenozoic Era : 65 mya - present |
| * Tertiary - more mammals, grasses, apes, hominids | * Tertiary - more mammals, grasses, apes, hominids | ||
| * Quaternary | * Quaternary | ||
| * Pleistocene (1.8 mya - 8000 ya) - mammoths, Neanderthals | * Pleistocene (1.8 mya - 8000 ya) - mammoths, Neanderthals | ||
| * Holocene (8000 ya - now) - modern humans | * Holocene (8000 ya - now) - modern humans | ||
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