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--- notes:history [2026/07/20 18:43]
177.37.190.249 old revision restored (2026/05/29 15:20)
+++ notes:history [2026/07/24 18:21] (current)
150.228.5.40 old revision restored (2026/06/15 18:43)
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     * 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
-    * Carboniferous - reptiles, amphibians, spiders, conifers, amniotic eggs (340 mya), synapsids
-    * Permian - synapsids (proto-mammalian reptiles) dominant.
-  * 250 mya - Extinction event, 83% of species die 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
+  * Cenozoic Era : 65 mya - present
-    * 200 mya - Tr-J extinction event allows dinosaurs to start becoming dominant. Kills > 50 % of species.
-    * Jurassic - squids, frogs, 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 - 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 behavioural and cultural characteristics vary significantly based on location since different areas developed at different rates. Figures given here are a rough average estimate.
-  * 4 mya - earliest humans
-  * ** Stone Age ** : 2.5 mya - ~3000 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 (and the Pleistocene era) ends.
-    * Mesolithic age -  ~8000BC - ~6000BC - Rising sea levels force a need to adapt. More complex settlements and the first tribes appear. Microlithic tools and boats are developed and fishing becomes a source of food.
-    * Neolithic age - ~6000BC - ~3000BC - Agriculture (farming and herding) and related tools (plough, hoe, yoke etc) are developed. Domestication of animals begins. The earliest towns and temples are from this age.
-  * ** Bronze Age ** :
-  * ** Iron Age ** :
-  * ** Classical Era ** :
-  * ** Middle Ages **
-  * ** Reformation & Renaissance **

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