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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.
Geological time scale. The vast expanse of geological time has been separated into eras, periods, and epochs. The numbers included below refer to the beginnings of the division in which the title appears. The numbers are in millions of years. The named divisions of time are for the most part based on fossil evidence and principles for relative dating over the past two hundred years.