REVIEW: The Fossil Record

If you know the age of a fossil, you know the relative age of the ________________ it was found inside.

• sticky tar

• rock

• amber

• ice

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Geologists use radioactive dating to..

• determine the relative ages of rock layers.

• tell the difference between molds and casts.

• tell where one soil horizon ends and the next one begins.

• determine the absolute ages of rocks.

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What are the oldest fossils and why?

• B, C- because they are closest to the top

• A, B- because they are closest to the bottom

• They are all the same age- because they are all found on layer 2

• A, B- because they are found closest to the top

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According to the law of superposition, which layer is the youngest?

• A
• B
• C

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If scientists found this fossil, what could they infer?

• what fish are like today

• that this fish lacked oxygen

• that water once covered the area where this fossil was found

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Fossils of fish are found under land where cows now live. What does this tell you?

• the fish were dropped their by flying birds

• this land was once under the ocean

• fish used to live on land

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Fossil A is an ancient mollusk, an organism that needs water to survive. Why do you think that the mollusk went extinct in this particular sample of the fossil record?

• When the ocean levels rose in layer 4, the mollusk went extinct because they cannot live in water

• For some reason, the ocean disappeared causing the mollusk to thrive

• For some reason, the ocean disappeared causing the mollusk to go extinct

• When the ocean level rose in layer 4, the mollusk thrived because they need water

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When did fossil A become extinct?

• Layer 1

• Layer 2

• Layer 3

• Layer 4

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Organisms D and C clearly lived in an aquatic (water) environment. Organism A does not look like it lived in the water. What is the most likely explanation for this?

• The fossil in layer A died on land and was carried to the water

• The fossils in layer C and D did not live in the same location as the fossil in layer A

• The environment changed over a long period of time. It used to be under water, but is not anymore

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The millions of fossils that scientists have collected are called

• The Geologic Time Scale
• The Origin of Species
• The Fossil Record
• A really neat fossil collection

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