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eons

This webpage is under construction.

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

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

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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

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multicellular organisms evolved independently in multiple kingdoms

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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

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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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