Geologic Time Scale

The geologic time scale is a record of

 

•   the thickness of sedimentary rock layers.

• the rate of fossil formation.

• the life forms and geologic events in Earth’s history.

• the time since the evolution of dinosaurs.

   

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The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called

• epochs

• periods

• layers

• eras

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The earliest life-forms appeared during

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

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To develop the geologic time scale, scientists studied rock layers and fossils.

• True

• False

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   List the units of geologic time in order from the largest to the smallest.

• epochs, periods, eras, eons

• periods, eras, eons, epochs

• eons, eras, periods, epochs

• eons, periods, eras, epochs

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  A trend we see in the geologic time scale is that fossils become more _____________ over time.

• simple

• complex

• heavy

• difficult

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On the geologic time scale, periods are divided into what units?

• eras

• eons

• decades

• epochs

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What is the end of life for groups of organisms that causes the end of an era?

• wipeout

• transition

• turning point

• mass extinction

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Reptiles, such as dinosaurs, were so successful during this era that this time is often called the Age of Reptiles.

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

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Mass extinctions occurred at the end of what eras?

• Paleozoic and Cenozoic

• Paleozoic and Mesozoic

• Mesozoic and Cenozoic

• Precambrian and Mesozoic

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