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Earth History

A Trip through Geologic Time

TermDefinition
Fossil the preserved remains or traces of living things in different types of rocks or other mediums.
Mold Type of fossil that is a hollow area in sediment the shape of an organism or part of an organism.
Cast Type of fossil that is a solid copy of the shape of an organism.
Trace fossils Type of fossil that provides evidence of the ancient organisms like foot prints.
Relative Age Age of a fossil or rock compared to the ages of other rocks or fossils.
Absolut Age The age of rock in number of years since formation.
Law of Superposition In horizontal rock layers, the rock layer that is on the bottom will be the oldest layer.
Unconformity The surface where new rock layers meet a much older rock surface beneath them.
Index Fossil A fossil that tell the relative ages of the rock layers in which they occur.
Created by: MrCscience
 

 



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