SINCE 1828
biostratigraphy
noun
bio·stra·tig·ra·phy
| \ ˌbī-ō-strə-ˈti-grə-fē
\
\
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
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