Orange County Geology and Paleontology

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PDF File Orange County Geology and Paleontology. Geologic Time Scale. Figure 1 is the standard geologic time scale for the history of planet Earth. The various named subdivisions of the time scale provide a calendar of earth history. The last ~ 550 million years (Ma) of earth history is called the PHANEROZOIC EON, the age of complex, megascopic, multicellular life, including animals and plants (Figure 1)

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