Geological Timescale

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Last updated 4:25 PM on 5/3/26
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8 Terms

1
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What is the Geological Timescale?

A series of time intervals that divides the Earth's history into manageable time frames.

2
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What are the main divisions of the Geological Timescale?

Eons, Eras, Periods, and Epochs.

3
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What is an eon?

The longest time period in the Geological Timescale, lasting hundreds of millions of years.

4
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What is the most recent eon called and when did it begin?

The Phanerozoic eon, which began about 500 million years ago.

5
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What are eras?

Smaller time periods that eons are divided into, characterized by significant events in Earth's history.

6
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Name the three eras of the Phanerozoic eon.

Cenozoic, Mesozoic, and Paleozoic eras.

7
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What is a period in the context of the Geological Timescale?

Variances in time divisions within eras, each representing different lengths of time.

8
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List some periods of the Paleozoic era.

Permian, Carboniferous, Devonian, Silurian, Ordovician, and Cambrian Periods.