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Era T'aae Period I Estimated Estimated a Epoch Rock Series Duration. I Years Sims Rask System i Years Beginning Quaternary Recent Epoch Recent 110 to 25.000 I Pleistocene I Pleistocene 1 million 1 1 million e w` I Tertiary Pliocene (Pliocene 12 million 13 million c i Miocene Miocene 12 million 25 million v Oligocene Oligocene 11 million 36 million Eocene Eocene 22 million 58 million Paieocene Paleocene 5 million 1 63 million Cretaceous Late Cretaceous !Upper Cretaceous I 62 million a Early Cretaceous !Lower Cretaceous 135 million WA I c Jurassic Late Jurassic Upper Jurassic y a I ! Early Jurassic Lower Jurassic 46 million j 181 million � i I Triassic Late Triassic I Upper Triassic 49 million Early Triassic I Lower Triassic 230 million 1 Permian i Late Permian Upper Permian 50 million Early Permian ` Lower Permian i 280 million I 'Pennsylvanian., Late Pennsylvanian I Upper Pennsylvanian Middle Pennsylvanian t Middle Pennsylvanian 65 II Early Pennsylvanian I Lower Pennsylvanian million i *Mismssippian Late Mississippian Upper Mississippian Early Mississippian I Lower Mississippian 345 million E Devonian Late Devonian Upper Devonian 60 Middle Devonian Middle Devonian million c Early Devonian Lower Devonian 405 million m CM Silurian Late Silurian Upper Silurian 20 Middle Silurian Middle Silurian million Early Silurian Lower Silurian 425 million Ordovician Late Ordovician Upper Ordaviciari75 Middle Ordovician Middle Ordovicianmillion Early Ordovician Lower Ordovician 500 million Cambrian Lam Cambrian Upper Cambrian 100 Middle Cambrian Middle Cambrian million Early Cambrian Lower Cambrian 600 million Precambrian Informal subdivisions used locally Over 3 billion *Considered subdivisions of the Carboniferous Rock System I k'qKLE I N FELDER GEOLOGIC TIME SCALE PREPARED BY: DATE: