A principle that states that geologic processes that occurred in the past can still be explained by the current geologic processes

A trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock

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

Any method of determining whether an event or object is older or younger than other events or objects

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

A principle that states that younger rocks lie above older rocks if the layers have not been disturbed

the scientific study of fossils

The death of every member of a species

An arrangement of rock layers in which the oldest rocks are at the bottom

a fossilized mark that is formed in soft sediment by the movement of an animal

In a geologic column, where is the oldest rocks and fossils found?

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