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--- notes:history [2026/07/22 13:04]
187.191.39.64 old revision restored (2026/07/17 23:42)
+++ notes:history [2026/07/25 03:25] (current)
216.73.217.13 old revision restored (2026/07/24 03:12)
@@ Line 57: / Line 57: @@
     * 3.8 bya - first life on Earth
     * 3.5 bya - photosynthesis starts
+    * 3.3 bya - 2.8 bya - Vaalbara supercontinent exists
   * Proterozoic Eon : 2.5 bya - 550 mya
     * 2.4 bya - oxygen becomes significant component of the atmosphere
-    * 1 bya - multicellular plants (algae) and animals
     * 1 bya - 800 mya - Rodinia supercontinent exists
     * 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 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
+    * Devonian - first tetrapods (lizards)
-    * Carboniferous - reptiles, amphibians, spiders, conifers, amniotic eggs (340 mya), synapsids
+    * Carboniferous - reptiles, amphibians, spiders, confiers, synapsids
-    * Permian - more synapsids (proto-mammalian reptiles).
+    * Permian - more synapsids (mammal-like reptiles)
-  * 250 mya - Extinction event, 95% of life dies off
   * 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
-  * 65 mya - Meterorite extinction event (off Yucatan peninsula) kills off most large animals
+  * 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

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