stratigraphy

/stษนษ™หˆtษชษกษนษ™fi/
noun
  1. 1

    The study of rock layers and the layering process (stratification).

  2. 2

    The layering of deposits, with newer remains overlaying older ones, forming a chronology of the site.

Source: https://en.wiktionary.org/wiki/stratigraphy