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| Geologic Time | Paleozoic Era | Mesozoic Era | Cenozoic Era | The Geologic Time Scale The study of the Earth from the beginning of time to the present has been the task of geologists who attempt to unravel the events that have shaped our planet as it is today. The Earth carries the history of geological events in its rock layers.
Geologic Time and the Age of Rocks Geologists use fossils to divide Earth history into named intervals, and they use the rate of radioactive decay to determine the numeric age of those intervals. This map classifies the geologic materials of the San Francisco Bay region by age, dividing them into eons, eras, periods, and epochs of geologic time.