Geologic Time

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

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

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

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 scientific study of fossils

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

The death of every member of a species

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