Geological History

An overview of Earth.

Age Period Time (mya) Comments
Cenozoic  6.5  
Mesozoic  248 Age of Dinosaurs 
Paleozoic     
  Permian286  
  Pennsylvanian320  
  Mississipian360  
  Devonian417  
  Silurian443  
  Ordovician495  
  Cambrian545  
PreCambrian  2,500 Earth is formed