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Stratigraphy is the branch of geologic science that has to do with the definition and description of major and minor natural divisions of rocks, mainly sedimentary, and interpretation of their significance in geologic history. It involves determination of the sequence of rocks, both locally and in the general time scale, tracing their areal distribution, observation of lateral and vertical variations in their characters, correlation of equivalent but possibly widely dissimilar units, and, finally, study of conditions or geologic events that are involved in their genesis. There are no other branches of geology to which stratigraphy is not more or...

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