a branch of geology dealing with the differentiation of sedimentary rock units on the basis of the fossils they contain.

bio- + stratigraphy

biostratigraphic [bahy-oh-strat-i-graf-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
biostratigraphy   (bī'ō-strə-tĭg'rə-fē)  Pronunciation Key 
The study and categorization of rock strata based on their fossil content and distribution. Biostratigraphic data are often considered together with radiometric and paleoenvironmental data as a means of dating rock strata. Compare lithostratigraphy.
The American Heritage® Science Dictionary
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