- the arrangement of rocks in layers or strata
- the branch of geology dealing with the study of the nature, distribution, and relations of the stratified rocks of the earth's crust
Origin of stratigraphy; from stratum + -graphy
The study of rock strata, especially the distribution, deposition, and age of sedimentary rocks.
- strat′i·graph′ic , strat′i·graph′i·cal
(countable and uncountable, plural stratigraphies)