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Measuring Geologic Time. LARGEST unit of time;. Eon:. +/- billion yrs. Era:. +/- hundred million yrs. Scale:. 1 square = 10 million yrs. Period:. +/- ten million yrs. Epoch:. smallest unit of time. p resent day. 5 00 m.y.a . 4 00 m.y.a . 3 00 m.y.a . 2 00 m.y.a .
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Measuring Geologic Time LARGEST unit of time; Eon: +/- billion yrs Era: +/- hundred million yrs Scale: 1 square = 10 million yrs. Period: +/- ten million yrs Epoch: smallest unit of time present day 500 m.y.a. 400 m.y.a. 300 m.y.a. 200 m.y.a. 100 m.y.a. Phanerozoic Eon Mesozoic Era Cenozoic Era Paleozoic Era Quat. Pd. Tertiary Period Enlarged ~ 200 x Holocene Epoch Pleistocene Epoch