Geological Timescale and Extinction

What is the importance of studying fossils?

• to provide information about how current life forms would exist in previous environmental conditions

• to provide information about how life and environmental conditions may have changed

• to provide information about how previous life forms would exist in current environmental conditions

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6. A branch of geology dealing with the arrangement of sedimentary rock layers or strata?

• Stratigraphy

• Geography

• Photography

• Biography

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Geologists assume the newest rock layers are on top of the older ones, unless some type of disturbance occurs, in known as …

• Law of Inclusions

• Law of Crosscutting

• Law of Conservation

• Law of Superposition

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Approximately how old is the Earth?

• 4.6 billion years old

• 4.6 million years old

• 5 billion years old

• 5 million years old

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The biggest time period into which scientists have divide the time between the formation of the Earth and now is called:

• periods

• epochs

• eons

• eras

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What are eons divided into?

• eras

• epochs

• periods

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Look at the diagram.

Which era do we live in?

• phanerozoic

• neogene

• cenozoic

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How long ago did the Mesozoic era begin?

• 542 million years ago

• 250 million years ago

• 65 million years ago

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Dinosaurs lived in this era.

• Mesozoic

• Cenozoic

• Paleozoic

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Which Layer is the oldest?

• A

• X

• G

• Z

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