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1. The era before the appearance of life. Range 450,000,000 years to 1,000,000,000 or that's 550,000,000 years ago - Archaic Era

 

2. The era of origin of life. Range 150,000,000 years to 550,000,000 or that's 400,000,000 years ago - Proterozoic or Algonic Era

 

3. The Age of Marine Life. Range 250,000,000 years to 400,000,000 or that's 150,000,000 years ago - Paleozoic or Paleozoic Era

   A. The Age of Trilobites. Range 50,000,000 years to 400,000,000 or that's 350,000,000 years ago - Cambrian

   B. Age of Invertebrates. Range 50,000,000 years to 350,000,000 or that's 300,000,000 years ago - Ordovician

   C. The brachiopod era. Range 25,000,000 years to 300,000,000 or that's 275,000,000 years ago - Silurian

   D. The Age of Pisces. Range 50,000 years to 275,000,000 or that's 225,000,000 years ago - Devonian

   E. The Age of Frogs. Range 50,000 years to 225,000,000 or that's 175,000,000 years ago - Carbon

   F. The era of biological shocks. Range 25,000,000 years to 175,000,000 or that's 150,000,000 years ago - Permian

 

 

4. The era of early terrestrial life. Range 100,000,000 years to 150,000,000 or that's 50,000,000 years ago - Mesozoic

   А. The era of early ruminants. Range 25,000,000 years to 150,000,000 or that's 125,000,000 years ago - Triassic

   B.  Age of Reptiles. Range 25,000,000 years to 125,000,000 or that's 100,000,000 years ago - Jurassic

   C. Ending era of ruminants, era of birds, flowering plants. Range 50,000,000 years to 100,000,000 or that is 50,000,000 years ago - Cretaceous

 

5. The Age of Mammals. Range 50,000,000 years to 50,000,000 years ago to present time - Neozoic

   A. Era of early mammals. Range 15,000,000 years to 50,000,000 or that's 35,000,000 years ago - Eocene

   B. Era of more advanced mammals. Range 10,000,000 years to 35,000,000 or that's 25,000,000 years ago - Oligocene

   C. Era of the Elephant and the Horse. Range 15,000,000 years to 25,000,000 or that's 10,000,000 years ago - Miocene

   D. Last Great Mammal Migration. Range 8,000,000 years to 10,000,000 or that's 2,000,000 years ago - Pliocene

   E. The Ice Age. Range 1,965,000 years to 2,000,000 or that's 35,000 years ago - Pleistocene