Geologic Time Scale  Instructions: Fill in the data table below to show the number of million of years each Era lasted. The Divisions of Geologic Time Percent Millions of Years The age of the Earth 100% 4,600 my Cenozoic Era 1.5%   Mesozoic Era 4.0%   Paleozoic Era 6.5%   Precambrian Time 88.0%

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