Fossil and Geologic Time Scale Study Guide

What is a fossil?

• A stone found in the ocean that has formed over millions of years.

• Preserved remains or traces of living things.

• A rock that has a banded material.

Is this an image of a body fossil or trace fossil?

• Body

• Trace

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How is a mold fossil different than a cast fossil.

• A mold is an imprint of an organism and a cast is a copy of the imprint.

• A mold is a copy of the imprint that the fossil has made.

• A mold and cast fossil are both the same.

How can you tell the difference between the inside of a bone and the inside of a branch?

• The bone has tiny holes or cavities inside and the branch does not.

• The branch has tiny holes or cavities inside and the bone does not.

• It is difficult to tell because they look similar.

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Which layer shows the fossils that are the oldest?

• Layer F

• Layer C

• Layer B

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Which layer shows the fossils that are the youngest?

• Layer F

• Layer C

• Layer B

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What was the first form of life on Earth?

• A bacteria called stromatolite

• Dinosaurs

• An amphibian called Plethropod

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What does the fossil record provide for us?

• Evidence that dinosaurs became extinct due to meteor explosions.

• Evidence that animals all once had fur.

• Evidence about the history of life on Earth.

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Which layer shows a trace fossil?

• Layer D

• Layer F

• Layer B

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In which era were mammals dominant?

• Paleozoic

• Precambrian

• Cenozoic