era - one of three long and distinct divisions of geologic time, period - a length or portion of an era, precambrian - a geologic time where formation of volcanoes , land formation, continents, and formation of one celled organism, paleozoic - a period of rapid diversification of life,also known as RISE OF LIFE at the beginning of this period, mesozoic - this era is also known as the Age of the Dinosaurs, cenozoic - This operiod is also known as Age of Mammals,

Geologic Time Scale

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