Lesson 2: Geologic Time Scale

A record of the geologic events and the evolution of life forms

• Geological Time Scale

• Precambrian time

• An unconformity

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Time before the Cambrian is called

• Geological Time Scale

• Precambrian time

• An unconformity

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The geologic time scale is broken up into

• eons

• eras

• periods

• epochs

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By studying geological time scale scientists can get a good idea of how animals

evolved and how the rock composition of an area has changed over time.

• True

• False

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Scientists have determined that Precambrian time is nearly ............ percent of Earth’s history.

• 88

• 77

• 99

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in the Geological Time Scale the largest sections are called

• epoches

• Eons

• Eras

• periods

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Eons are divides into

• epoches

• Eras

• periods

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periods are divides into

• epoches

• Eons

• periods

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Eras are divides into

• epoches

• Eons

• periods

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in the rock record due to the absence of a rock layer that was weathered and eroded.

• Geological Time Scale

• An unconformity

• Precambrian time.