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8U3C3

Fossil and Rock Ages

TermDefinition
fossil The preserved remains or traces of an organism that lived in the past
mineral replacement fossil after the organism dies, the spaces get filled in with minerals from groundwater that then harden
carbon films the fossilized carbon outline of an organism or part of an organism
Molds and Casts Impressions of an organism can be filled with minerals
original/whole remains a type of fossil in which all or part of the original organism has been preserved
trace fossil a fossil of a footprint, trail, burrow, or other traces of an animal rather than of the animal itself.
geologist a scientist who studies the earth
paleontologist scientists who study fossils
relative dating Method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
absolute dating A technique used to determine the actual age of a rock
radioactive decay the breaking down of an element
Principal of superposition Rock layers on the bottom are older and decrease in age as you move up
Unconformities gaps in rock layers
index fossils distinctive fossils used to compare the relative ages of fossils
coal A fossil fuel that forms underground from partially decomposed plant material
Created by: Ms. Greenup
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