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notes:history

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notes:history [2026/11/02 16:01]
51.83.6.4 old revision restored (2026/09/01 12:39)
notes:history [2026/11/03 13:18] (current)
51.75.119.165 old revision restored (2026/09/03 15:06)
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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
-    * 1.8 - 1.5 bya - Columbia Supercontinent 
-    * 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 (Primary) Era : 550 - 250 mya +  * Paleozoic Era : 550 - 250 mya 
-    * Cambrian - small shelled animals, corals +  * Mesozoic Era : 250 - 65 mya
-    * Ordovician - starfish, jawless fish +
-    * Silurian - land plants, ferns, sharks, fish +
-    * Devonian - first tetrapods - evolution of fish onto land +
-    * Carboniferous - reptiles, amphibians, spiders, confiers, synapsids +
-    * Permian - more synapsids (mammal-like reptiles) +
-  * 300 mya - 250 mya - last supercontinent Pangaea exists +
-  * Mesozoic (Secondary) 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.1793664064.txt.gz · Last modified: 2026/11/02 16:01 by 51.83.6.4