Definitions and geologic diagrams for 21 types of tops or picks used by geologists working with subsurface stratigraphic correlations are presented to establish standards for distinguishing “normal” correlative tops from “estimated,” “faulted,” and other types of tops. There is a logical relation among some of the types, and thus they are grouped into a six-part descriptive classification. For geologists who plan to use computers and automatic plotting devices in working with subsurface data, unique three-letter abbreviations are recommended as computer codes for each type of top.

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