12 periods on the geologic time scale

Geologic time is divided into four large segments called Eons: Hadean, Archean, Proterozoic, and Phanerozoic. The Phanerozoic Eon is divided into Eras: Paleozoic, Mesozoic, and Cenozoic.

For more: http://sciaeon.org/geology-and-geoscience/home

For Manuscript submission: http://www.sciaeon.org/submit-paper

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