The Rock and Fossil Record

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Younger rock is over older rock.

A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time.

A unit of geologic time that includes two or more periods.

The time when eras are divided.

Used for dating things that lived within the last 50,000 years.

A naturally preserved evidence of animal activity.

The use of rock layers to determine age.

A principle that states that geologic change occurs suddenly.