Learn how to say Stratigraphical correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word stratigraphy:
the branch of geology concerned with the order and relative position of strata and their relationship to the geological timescale.
the analysis of the order and position of layers of archaeological remains.
the structure of a particular set of strata:
you can find materials at the surface which are samples from the deeper stratigraphy
mid 19th century: from stratum + -graphy