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Definition of: stratigraphy
(strə·tig′rə·fē) noun
1. The order and relative position of the strata of the earth's crust.
2. The study or description of such strata; stratigraphic geology. [<STRATI- + -GRAPHY]
—strat·i·graph·ic (strat′·ə·graf′ik) or ·i·cal adjective
—strat′i·graph′i·cal·ly adverb
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