'Yrs scale' diaporamas de présentation

Measuring Geologic Time

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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