Earth History Vocabulary Review BW 12.10

Front

The branch of science involving the physical composition and history of the planet.

Back

Geology

Front

The system of time measurement involving the formation of and changes of the Earth.

Back

Geologic Time Scale

Front

Very large division of geologic time; usually referred to as the longest division of time.

Back

Eon

Front

Subdivision of an eon (Paleozoic, Mesozoic, Cenozoic)

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Era

Front

Subdivision of an Era: Era, Eon, Period, Epock

Back

Period

Front

Subdivision of a period; shortest division of geologic time.

Back

Epoch

Front

Occurs when a species( organism) dies out and no longer lives on the planet.

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Extinction

Front

Determination of the age of a rock based on the surrounding evidence

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Relative Age

Front

A common fossil found in many areas from a specific time; used to help identify the age of other formations.

Back

Index Fossil

Front

Remains or impression of an organism preserved in petrified rock.

Back

Fossil