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 To better study Earth and the many changes it has experienced, scientists use the geologic time scale.

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Presentation on theme: " To better study Earth and the many changes it has experienced, scientists use the geologic time scale."— Presentation transcript:

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3  To better study Earth and the many changes it has experienced, scientists use the geologic time scale.

4  Divides Earth’s long history into separate periods of time  Divisions are based on important events  Examples – climatic changes, presence of major life forms

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6  Largest geologic time divisions  Two earliest eons cover nearly a billion years

7 EonMillions of Years Ago PhanerozoicCurrent eon Proterozoic2,500 Archean3,800 Hadeon4,600

8  Eons are divided into eras  Eras are divided into shorter periods  The most recent periods, the Tertiary and Quaternary, are divided into epochs

9  Scientists study fossils to learn about Earth’s History

10  Fossil evidence indicates that dinosaurs and other reptiles dominated the Mesozoic era

11  This era is often called the Age of Reptiles


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