Meaning of STRATIFICATION in English
Layering that occurs in most sedimentary rock s and in igneous rock s that are formed at the Earth's surface, such as from lava flows and volcanic deposits.
The layers (strata) may range from thin sheets that cover many square miles to thick lenslike bodies that are only a few feet wide.
Britannica Concise Encyclopedia. Краткая энциклопедия Британика. 2012