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Chapter 10

TermDefinition
mold The mineralized impression of the organism left in the sediment
fossil he remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
cast The mineralized sediment that fills the mold recreates the shape of the remains.
index fossil represent species that existed on Earth for a short length of time, were abundant, and inhabited many locations
relative age the age of rocks and geologic features compared with other rocks and features nearby.
correlation matching rocks and fossils from separate locations
catastrophism the idea that conditions and organisms on Earth change in quick, violent event
superposition the principal that in undistured rock layers, the oldest rocks are on the bottom
radioactive decay the process by which an unstable element naturally changes into another element that is stable
uncomformity a surface where rock has eroded away, producing a break, or gap, in the the rock record.
isotope atoms of the same element that ahve different number of neutrons
carbon film the fossilized carbon outline of an organism or part of an organism
half-life the time required for half of the parent isotopes to decay into daughter isotopes
absolute-age the numerical age, in years, of a rock or object
uniformitarianism the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
trace fossil a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
paleontologist a scientist who specializes in the study of life forms that existed in previous geologic periods, as represented by their fossils
super position the principle that in undisturbed rock layers, the oldest rocks are on the bottom
Created by: Alejandra Franco
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