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Geologic Time/Dating

QuestionAnswer
fossils remains imprints or traces of prehistoric organisms
geologic time scale division in earths history into time units based on types of organisms that lived at that time
Precambrian era longest part of earths history
Paleozoic era era of ancient life which began about 544 million years ago organisms developed hard parts and ended with mass extinctions about 245 million years ago
Mesozoic era middle era of earth history during which Pangaea broke apart dinosaurs appeared and reptiles and gymnosperms were the dominant life forms
Cenozoic era era of recent life that began 66 million years ago and continues today
fossil record the collective group of all fossils already discovered
extinction no longer in existence no members of the species still alive
relative age the age of something compared to other things
law of superposition states that in undisturbed rock layers the oldest fossils are on the bottom
index fossils remains of a species that did not live long and were wide spread
fossils remains imprints or traces of prehistoric organisms
geologic time scale division in earths history into time units based on types of organisms that lived at that time
Precambrian era longest part of earths history
Paleozoic era era of ancient life which began about 544 million years ago organisms developed hard parts and ended with mass extinctions about 245 million years ago
Mesozoic era middle era of earth history during which Pangaea broke apart dinosaurs appeared and reptiles and gymnosperms were the dominant life forms
Cenozoic era era of recent life that began 66 million years ago and continues today
fossil record the collective group of all fossils already discovered
extinction no longer in existence no members of the species still alive
relative age the age of something compared to other things (or in relation to something)
law of superposition states that in undisturbed rock layers the oldest fossils are on the bottom and the youngest are on the top
index fossils remains of a species that did not live long and were wide spread
trilobites organisms with a three lobed exoskeleton that is considered an index fossil
ice cores a core sample that is typically removed from an ice sheet most commonly polar ice
fault a crack in the earths crust
rock cycle a continuous process by which rocks change from one form t another
absolute age age in years
law of original horizontality Sedimentary rock layers first form in flat, horizontal layers
law of lateral continuity rock layers spread out in all directions, so layers on opposites sides of a canyon were once connected
law of cross-cutting relationships anything that cuts through rocks is younger than the rock it cuts
law of inclusions the pieces of rock inside another rock are older than the rock they are in
Created by: Mrs.Rogers
 

 



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