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...Geologic time and earth s biological history designed to meet south carolina department of education science academic standards table contents what is the scale slide standard epochs eons eras periods how was its divisions created a complete with references c slides principles superposition horizontality original lateral continuity principle biologic succession charles lyell cross cutting relations inclusion darwin relative age dating using unconformities index fossils absolute isotopes radiometric carbon old breakdown are we now living in anthropocene era cont through ordovician silurian devonian mississippian pennsylvanian permian triassic jurassic cretaceous quaternary adaptation punctuated events comet impact climate shift volcanism extinction study fossil types recognize relationship among units epoch period into which divided does represent divides up based on life forms that have existed during specific times since creation planet these called geochronologic geo rock chronology ...