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10 Cards in this Set
- Front
- Back
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Carbon Flims
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An extremely thin coatin of carbon on rock
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Cast
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a solid copy of the shape of an organism
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Extrusion
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Lava that hardens on the surface
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Fossils
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the remains of traces of ancient life
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Fossil record
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The complete body of fossils that show how species and ecosystem change over time
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Index Fossils
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a fossil found in a narrow time range but widely distributed around the Earth; used to date rock layers
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Law of Superposition
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states that the oldest roks lay on the bottom any of the youngest rocks are on top of any undistrubed sequence of sedimentary rocks
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Mold
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a hollow area in sediment in the shape of an organism
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Preserved remains
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remains of an organism preserved with little or no change(ice,tar,amber)
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Trace fossil
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a fossilized mark that is formed in soft sediment by the movement or actions of an animal
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