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The Geologic Time Scale
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The Geologic Time Scale. Mass extinctions. 99.9% of all living things that have ever existed on earth have gone extinct earth has experienced 5 five extinctions . Geologic time scale. Era Largest unit of geologic time
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The Geologic Time Scale
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Mass extinctions • 99.9% of all living things that have ever existed on earth have gone extinct • earth has experienced 5 five extinctions
Geologic time scale • Era • Largest unit of geologic time • lasts tens to hundreds of millions of years and consists of two or more periods. • Period • Divides Eras • Most commonly used units of time scale • Lasts millions of years • Each is associated with a particular rock system • Epochs • Divide Periods • Smallest unit of geologic time • Lasts several million years
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