The time when eras are divided.

The use of rock layers to determine age.

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

Any method of measuring the age of an event or object in years.

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

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

The standard method used to divide the Earth's long natural history into manageable parts.

A subdivision of a geologic period.

A mark or cavity made in a sedimentary surface by a shell or other body.

A principle that states that geologic change occurs suddenly.

A fossil that is found in the rock layers of only one geologic age and that is used to establish the age of the rock layers.

The death of every member of species.

The era that came to an end with the largest mass extinction.

Younger rock is over older rock.

A naturally preserved evidence of animal activity.

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