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*Considered subdivisions of the Carboniferous Rock System <br />J. H. KLEINFELDER & ASSOCIATE5 <br />GEOTECHNICAL CONSULTANTS — MATERIALS TESTING <br />PREPARED BY: SRD DATE. 12-10-81 <br />r1l4Cr1v WM OV. MAT CI <br />GEOLOGIC TIME SCALE <br />oon —O — c_1Rr1G_9G 1 — — ..w <br />Torte Psriod <br />Estimsted <br />Estimated <br />Era <br />or <br />Epoch <br />Rock Series <br />I <br />0"ioo. <br />vara Sna <br />Rock System <br />Yate <br />309irma9 <br />Quaternary I <br />Recant Epoch ( <br />Recant <br />10 to 25.000 <br />Pleistocene <br />Pleistocene <br />1 million <br />1 million <br />e <br />w` <br />v <br />Tertiary <br />Pliocene <br />Pliocene <br />12 million <br />13 million <br />0 <br />Miocene <br />Miocene <br />12 million <br />25 million <br />vOligocene <br />Oligocene <br />11 million <br />36 million <br />Eocene <br />Eocene <br />22 million <br />58 million <br />Paiaocane <br />Paleocane <br />5 million <br />63 million <br />Cretaceous <br />Late Cretaceous <br />Upper Cretaceous <br />62 million <br />m <br />Early Cretaceous <br />Lower Cretaceous <br />135 million <br />Lu <br />Jurassic <br />Late Jurassic <br />Upper Jurassic <br />46 million <br />Early Jurassic <br />Lower Jurassic <br />181 million <br />Triassic <br />Late Triassic <br />Upper Triassic <br />49 million <br />Early Triassic <br />Lower Triassic <br />230 million <br />Permian <br />Late Permian <br />Upper Permian <br />50 million <br />Early Permian <br />Lower Permian <br />280 million <br />'Pennsylvanian <br />Late Pennsylvanian <br />Upper Pennsylvanian <br />Middle Pennsylvanian <br />Middle Pennsylvanian <br />65 <br />Early Pennsylvanian <br />Lower Pennsylvanian <br />million <br />'Mississippian <br />Lata Mississippian <br />Upper Mississippian <br />Early Mississippian <br />Lower Mississippian <br />345 million <br />® <br />Devonian <br />Late Devonian <br />Upper Devonian <br />LU <br />Middle Devonian <br />Middle Devonian <br />60 <br />o <br />Early Devonian <br />Lower Devonian <br />million <br />405 million <br />c <br />li <br />Silurian <br />Late Silurian <br />Upper Silurian <br />20 <br />Middle Silurian <br />Middle Silurian <br />million <br />Early Silurian <br />Lower Silurian <br />425 million <br />Ordovician <br />Lata Ordovician <br />Upper Ordovician <br />75 <br />Middle Ordovician <br />Middle Ordovician <br />million <br />Early Ordovician <br />Lower Ordovician <br />500 million <br />Cambrian <br />Late Cambrian <br />Upper Cambrian <br />100 <br />Middle Cambrian <br />Middle Cambrian <br />million <br />Early Cambrian <br />lower Cambrian <br />600 million <br />Precambrian <br />I Informal subdivisions used locally <br />I Over 3 billion <br />*Considered subdivisions of the Carboniferous Rock System <br />J. H. KLEINFELDER & ASSOCIATE5 <br />GEOTECHNICAL CONSULTANTS — MATERIALS TESTING <br />PREPARED BY: SRD DATE. 12-10-81 <br />r1l4Cr1v WM OV. MAT CI <br />GEOLOGIC TIME SCALE <br />oon —O — c_1Rr1G_9G 1 — — ..w <br />