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Have you ever wondered what kind of rocks contain fossils? Can fossils form in all kinds of rock?
A fossil is a mark or the remains of a very old animal or plant. Usually you will find fossils in rocks.
Rocks with fossils in them have been hidden under the Earth's surface for many years. Finally, after weathering and erosion, the rocks with fossils in them become visible on Earth's surface.
Remember that usually only the hard parts of an organism change into a fossil.
A fossil forms by an organism being buried by sediment. Over time, the organism's parts are replaced by minerals that are dissolved in water. So, the fossils we see are really mineral deposits, not the real body parts.
Questions for review:
Draw a poster to show which type of rock allows fossils to form. Explain why they are found in this type of rock! 

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Teachers should view the Teacher Site Map to relate Sci-ber text and the USOE 4th grade science core.

Updated October 24, 2008 by: Glen Westbroek

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