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notes:history

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notes:history [2026/11/02 15:33]
90.248.250.121 old revision restored (2026/09/16 11:44)
notes:history [2026/11/03 05:02] (current)
103.25.220.57 old revision restored (2026/08/03 07:51)
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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.
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     * Carboniferous - reptiles, amphibians, spiders, conifers, amniotic eggs (340 mya), synapsids     * Carboniferous - reptiles, amphibians, spiders, conifers, amniotic eggs (340 mya), synapsids
     * Permian - more synapsids (proto-mammalian reptiles).      * Permian - more synapsids (proto-mammalian reptiles). 
-  * 250 mya - Extinction event, 95% of life dies off+  * 250 mya - Extinction event, 83% of species die off
   * 300 mya - 250 mya - last supercontinent Pangaea exists   * 300 mya - 250 mya - last supercontinent Pangaea exists
   * **Mesozoic (Secondary) Era** : 250 - 65 mya   * **Mesozoic (Secondary) Era** : 250 - 65 mya
     * Triassic - turtles, lizards, dinosaurs, mammals     * Triassic - turtles, lizards, dinosaurs, mammals
 +    * Extinction event 200 mya allows dinosaurs to start to become dominant. Kills > 50 % of species.
     * 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
notes/history.1793662382.txt.gz · Last modified: 2026/11/02 15:33 by 90.248.250.121