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Appendix B: The International Geological Time Scale (Time-Rock Divisions) HADEAN ARCHEAN PROTEROZIC EON ERA PERIOD EPOCH AGES IN MILLIONS OF YEARS Recent Pleistocene QUATERNARY NEOGENE T ERTIARY PALEOGENE Pliocene Miocene Oligocene Eocene Paleocene PHANEROZIC PRE-PHANEROZIC Paleozoic Mesozoic Cenozoic CRETACEOUS JURASSIC TRIASSIC PERMIAN CARBONIFEROUS DEVONIAN SILURIAN ORDOVICIAN CAMBRIAN Mesoproteroaoic Neoproterozoic (Not to scale) Paleoproterozoic 0 2 5 23 34 56 65 145 208 245 290 362 408 440 510 542 1,000 1,600 2,500 4,000 4,600 (Origin of Earth) (Oldest rocks) ...

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