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10 Cards in this Set
- Front
- Back
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thin film of carbon residue is left, forming a silhouette or the original organism
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carbon file
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type of body fossil that forms in rock when an organism with hard parts is buried, decays or dissolves, and leaves a cavity in the rock
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Mold
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fossils in which the spaces are filled with minerals from groundwater
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permineralized remains
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type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock
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Cast
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remains of species the existed on earth for relatively short periods of time, were abundant, and were widespread geographically
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Index fossils
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princeple that states that the same processes that shaped the earth are still at work today
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uniformitarianism
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states that in undisturbed layers of rock, the oldest rocks are on the bottom and the rockes become progressively younger toward the top.
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Principle of superposition
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can be determined by comparing its position to that of rocks in other layers
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Relative age
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atoms of the same element having different numbers of neutrons
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Isotopes
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an unconformity between parallel rock layers
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Disconformity
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