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| Two or more geological eras form an Eon, which is the largest division of geologic time, lasting many hundreds of millions of years. |
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| Two or more geological periods comprise an era, which is hundreds of millions of years in duration. |
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| 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. |
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| A single landmass, or supercontinent, that existed from about 350 million to 200 million years ago and was separated by plate tectonics, forming the current continents. |
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| A scientist who uses fossil evident to study life in prehistoric times. |
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Definition
| Periods of thousands, millions and billions of years referred to by geologists, paleontologists, and other scientists who study the earth's history. |
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