stra·tig·ra·phy (strə-tĭg'rə-fē) n. The study of rock strata, especially the distribution, deposition, and age of sedimentary rocks. strat'i·graph'ic (strāt'ĭ-grāf'ĭk), strat'i·graph'i·cal (-ĭ-kəl) adj., strat'i·graph'i·cal·ly adv.
stratigraphy (strə-tĭg'rə-fē) Pronunciation Key
The scientific study of rock strata, especially the distribution, deposition, correlation, and age of sedimentary rocks.