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science vocab 1

fossils and stuff

TermDefinition
Paleontologist a scientist who studies fossils
Relative Age the age of something compared with the age of something else
Principle of Superposition that in undisturbed layers of rock the oldest are on the bottom and getting younger toward the top
Mold cavity in rock left when the hard parts of an organism decay
Cast a type of fossil that forms when sediments fill the mold and harden into rock
Index Fossil remains of a species that existed for a relatively short period of time,were abundant,& widespread geographically can be used to assign ages of rock layers
Trace Fossil fossilized tracks/ other evidence of activity of organisms
Unconformity gap in the rock layer that is due to erosion or period w/o any deposition
Original Remains when conditions allow original soft parts of organisms to be preserved for thousands or millions of years
Fossil remains,imprints, or traces of prehistoric organisms
Permineralized Remains fossils where spaces inside are filled w/minerals from ground water
Carbon Films when a thin film or carbon residue forms when a silhouette of the original organism;carbonized plant becomes coal
Created by: rconner
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