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Definition of biostratigraphy
1 : the identification of fossils found within sedimentary rock strata as a method of determining the relative geologic age of the rock; also : the branch of paleontology involving such identification
2 : the arrangement of fossils in rock strata
biostratigraphic
\-ˌstra-tə-ˈgra-fik\ adjectiveExplore Merriam-Webster
Origin and Etymology of biostratigraphy
International Scientific Vocabulary
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