eons
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The evolutionary history of our planet is recorded in four great eons
Hadean Eon volcanic outflows and alien collisions saw hellish conditions from 4.6 – 4 BYA
9.2 BYs of cosmic, galactic, stellar, and global evolution preceded the Hadean Eon
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the sands of time recorded the 4 BY evolutionary history of life on Earth
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Earth’s geospheres evolved through prebiotic geochemical processes
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the late heavy bombardment may have extinguished any early life forms
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Archean Eon saw surface rocks form, plates move, and microbes evolve 4 – 2.5 BYA
the first cells evolved in the Hadean or Archean
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microbes evolved and adapted to every ecological niche
anoxygenic photosynthesis first evolved
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first continents formed in the Hadean or Archean
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Proterozoic Eon saw the endosymbiosis of five kingdoms of eukaryotes 2.5 – 0.541 BYA
oxygenic photosynthesis transformed the biosphere, atmosphere, oceans, and land
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endosymbiosis formed the complex Eukaryote cells
multicellular organisms evolved independently in multiple kingdoms
the 20 MY Cambrian explosion ended the Proterozoic eon
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Phanerozoic Eon began with the Cambrian explosion of animals 541 MYA - now
Paleozoic era plants and insects radiated onto land
Mesozoic era reptiles and dinosaurs ruled the supercontinent Pangaea
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Cenozoic era flowering plants filled many vacated ecological niches
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Cenozoic era mammals and birds filled many vacated ecological niches
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