biostratigraphic

adjective

bio·​strati·​graph·​ic ¦bī-(ˌ)ō-ˌstra-tə-¦gra-fik 

variants or less commonly biostratigraphical

¦bī-(ˌ)ō-ˌstra-tə-¦gra-fi-kəl

: of or relating to biostratigraphy : employing the methods of biostratigraphy

biostratigraphically

¦bī-(ˌ)ō-ˌstra-tə-¦gra-fi-k(ə-)lē

adverb

We used biostratigraphically dated units with correlatable magnetic polarity patterns …

—Joseph L. Kirschvink, et al., Science, 25 July 1997

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