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GEOLOGIC EONS, ERAS and PERIODS - Paleontology and Geology GlossaryGeologic TimeQuestions and AnswersIndex fossils - Paleontology and Geology GlossaryMesozoic DinosaursToday's featured page: Middle East



ZoomDinosaurs.com
Dinosaur and Paleontology Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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Geologic Time Periods

For a chart of geologic time on Earth, click here.


EON

Two or more geological eras form an Eon, which is the largest division of geologic time, lasting many hundreds of millions of years.

ERA

Two or more geological periods comprise an era, which is hundreds of millions of years in duration.

PERIOD

The period is the basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years.

EPOCH

An epoch is a division of a geologic period; it is the smallest division of geologic time, lasting several million years.

AGE

An age is a unit of geological time which is distinguished by some feature (like an Ice Age). An age is shorter than epoch, usually lasting from a few million years to about a hundred million years.

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GEOLOGIC EONS, ERAS and PERIODS - Paleontology and Geology GlossaryGeologic TimeQuestions and AnswersIndex fossils - Paleontology and Geology GlossaryMesozoic DinosaursToday's featured page: Middle East



ZoomDinosaurs.com
Dinosaur and Paleontology Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Click on an underlined word for more information on that subject.
If the dinosaur or paleontology term you are looking for is not in the dictionary, please e-mail us.

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