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notes:history

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notes:history [2026/07/21 09:15]
14.161.185.126 old revision restored (2026/05/31 05:38)
notes:history [2026/07/24 18:21] (current)
150.228.5.40 old revision restored (2026/06/15 18:43)
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   * 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     * 1 bya - 800 mya - Rodinia supercontinent exists
     * 770 - 750 mya - first ice age     * 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 +
-    * 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   * 300 mya - 250 mya - last supercontinent Pangaea exists
-  * Mesozoic (Secondary) 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.1784650506.txt.gz · Last modified: 2026/07/21 09:15 by 14.161.185.126