Editor's Note: The Geologic Column, which appears monthly in TLE, is (1) produced cooperatively by the SEG Interpretation Committee and the AAPG Geophysical Integration Committee and (2) coordinated by R. Randy Ray and Lee Lawyer.

As exploration extends into deeper water, it has become more important to understand the nature of the earth's crust beneath offshore sediments. That is, heat flow and related source rock potential usually require that sediments be deposited over continental crust. Hence, delineating the boundary between oceanic and continental crust becomes important. The material in this article was originally presented at the workshop “The Crust...

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