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--- notes:history [2026/09/16 11:44]
154.124.153.36 old revision restored (2026/07/27 06:11)
+++ notes:history [2026/09/16 12:04] (current)
216.73.216.94 old revision restored (2026/09/12 03:14)
@@ Line 60: / Line 60: @@
     * 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.
@@ Line 69: / Line 68: @@
     * Devonian - first tetrapods - evolution of fish onto land
     * Carboniferous - reptiles, amphibians, spiders, conifers, amniotic eggs (340 mya), synapsids
-    * Permian - more synapsids (proto-mammalian reptiles).
+    * Permian - synapsids (proto-mammalian reptiles) dominant.
-  * 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
   * **Mesozoic (Secondary) Era** : 250 - 65 mya
     * Triassic - turtles, lizards, dinosaurs, mammals
+    * 200 mya - Tr-J extinction event allows dinosaurs to start becoming dominant. Kills > 50 % of species.
     * Jurassic - squids, frogs, birds
-    * Cretaceous - more dinosaurs, flowering plants, snakes, modern fish, toothed birds
+    * Cretaceous - dinosaurs dominant, 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
-    * Tertiary - more mammals, grasses, apes, hominids
+    * Tertiary - mammals dominant, grasses, apes, hominids
     * Quaternary
       * Pleistocene (1.8 mya - 8000 ya) - mammoths, Neanderthals
       * Holocene (8000 ya - now) - modern humans
+===== Human History Overview =====
+Human historical ages based on technology vary based on location since different areas developed a different rates.
+  * 4 mya - earliest humans
+  * ** Stone Age ** : 2.5 mya - ~6000 BC
+    * Paleolithic age - 2.5 mya - ~8000BC
+      Still in the Pleistocene era. Human ancestors roam as bands of hunters/gatherers and use simple stone tools. Evolution from Homo Habilis to Homo Sapiens Sapiens. Ends when the last Ice age ends.
+    * Mesolithic age -  ~8000BC - ~6000BC
+      Rising sea levels force a need to adapt.
+    * Neolithic age - ~6000BC - ~3000BC
+  * ** Bronze Age ** :
+  * ** Iron Age ** :
+  * ** Classical Era ** :
+  * ** Middle Ages **
+  * ** Reformation & Renaissance **

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