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10 Cards in this Set

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