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ES Chapter 17 Leach

ES Chapter 17 Leach The Rock Record

QuestionAnswer
absolute age actual age of an object
amber hardened tree sap in which fossils may be preserved
angular unconformity boundary between horizontal and tilted layers of rock
bedding plane boundary between two sedimentary rock layers
coprolite fossilized waste material from an animal
disconformity boundary between layers of rock that have not been deposited continuously
evolution change of living things over time
gastrolith fossilized stone found within the digestive system of a dinosaur or other reptile
half-life time required for half the mass of a radioactive element to decay into its daughter elements
index fossil guide fossil used to establish the absolute age of the rock layers
law of crosscutting relationships principle that a fault or intrusion is always younger than the rock layers it cuts through
law of superposition principle that a sedimentary rock layer is older than the layers above it and younger than the layers below it
mummification preservation of a dead organism by drying
nonconformity unconformity in which stratified rock rests on unstratified rock
paleontologist scientist who studies fossils
paleontology study of fossils
petrification process in whick organic materials are replaced by new materials
principle of uniformitarianism theory that geologic processes at work in the present were also at work in the past
relative age age of an object compared with the ages of other objects
trace fossil fossil trace left by an ancient organism, such as a track, footprint, boring, or burrow
unconformity break in the geilogic record created when rock layers are removed by erosion
varve annual layer of sedimentary deposit on a lake bed
Created by: CoachLeach
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