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notes:history

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notes:history [2026/11/03 13:18]
51.75.119.165 old revision restored (2026/09/03 15:06)
notes:history [2026/11/03 17:07] (current)
145.239.69.44 old revision restored (2026/09/03 15:25)
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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's crust forms
     * 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
notes/history.1793740712.txt.gz · Last modified: 2026/11/03 13:18 by 51.75.119.165 · Currently locked by: 75.230.242.251