Earth History: Geologic Time Scale PowerPoint. A summary of the eras in Earth's geologic history with slides on the various time periods of planet Earth. Precambrian Eon: Azoic (Hadean and Archean), Proterozoic Eras; and the Phanerozoic Eon: Paleozoic, Mesozoic, Cenozoic, and Neozoic Eras.Each era is also divided into periods and epochs: Paleozoic: Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, and Permian Mesozoic: Triassic, Jurassic, and CretaceousCenozoic: Paleocene,