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Clues to Earths Past

Chapter 10

TermDefinition
Fossil Preserved remains or evidence of ancient living things
Catastrophism is the idea that conditions and organisms on Earth change in quick violent events.
uniformitarianism States the the geological processes that occur today are similar to those that have occurred in the past.
carbon film fossilized carbon outline of an organism or part of an organism
mold is the impression in a rock left by an ancient organism
cast fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits.
Paleontologist scientists who study fossils
Relative age age of rocks and geologic featured compared with other rocks and features nearby
superposition principal that in undisturbed rock layers,the oldest rocks are at the bottom.
inclusion a peice of an older rock that becomes part of a new rock.
unconformity surface where rock has eroded away, producing a break or gap in the rock record.
correlation matching rock and fossils from separate locations
index fossil represent species that existed on Earth for a short length of time, were abundant, and inhabited many locations
Absolute age to mean numerical age, in years,of a rock or object.
isotope atoms of the same element that have different numbers of neutrons,
radioactive decay process by which on unstable element naturally changes into another element that is stable.
Half-life the time required for half of the parent isotopes to decay into daughter isotopes.
Trace fossil preserved evidence of the activity of an organism
Created by: InaayaQ
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