stratification


stratification

Layering that occurs in most sedimentary rocks and in igneous rocks 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.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on stratification, visit Britannica.com.

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