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Geological Time

Unit 6 vocabulary

TermDefinition
fossil any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc.
index fossil a widely distributed fossil used in determining the age of related formations
permineralized remains fossils in which the spaces inside are filled with minerals from ground water
molds & casts a type of body fossil that forms in rock when an organism with hard parts is buried, decays, or disolves and leaves a cavity in the rock
original remains animal is trapped inside a rock or mineral (usually in amber or ice)
trace fossils fossilized tracks & evidence of organism's activity
relative age the age of something compared with other things
superposition in undisturbed layers of rock, the oldest layer is on the bottom and the newest is on the top
horizontality
absolute age age in years of a rock or other object
half- life time it takes for half the atoms of an isotope to decay
isotopes atoms of the same element that have different numbers of nuetrons
radioactive decay process in wich some isotopes break down into other isotopes and particles
geological time division of earths history into time units based largly on types of life forms that lived only during certain periods
eon longest subdivision in the geological time scale that is based on the abundance of certain types of fossils and is subdivided into eras periods and epochs
era second longest division of geological time; based on major worldwide changes in fossils
period third longest division of geological time
epoch
pangaea large ancient landmass that was composed of all the continents joined together
trilobite organism with a three lobed exoskeleton that was abundant in paleozoic oceans and is considered to be an index fossil
precambrian londest part of earths history, lasting from 4 billion to about 544 million years ago
mesozoic era middle era of earths history during which Pangea broke apart dinosaurs appeared and other stuff
cenozoic era era of recent life that began about 66 million years ago and continues today
Created by: 3082817
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