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A conceptual model for marine Pleistocene sedimentation in the Gulf of Mexico is described for the past 2.9 million years. It utilizes eight eustatic cycles (i.e., lowstands-highstands of sea level couplets) representing the four major periods of glaciation, planktonic foraminiferal and calcareous nannofossil marker species for establishing datum planes, foraminiferal abundance/diversity plots, and a relative paleotemperature curve that is tied in part to oxygen-isotope stages. Methodology used here to construct this conceptual model is termed multiple-event stratigraphy in which physical happenings and bioevents are applied jointly in delineating Pleistocene Stages rather than reliance on a single datum. Midcontinent conceptual stage names are adapted to Gulf of Mexico stratigraphy and are consistent with the glacial concept for the Pleistocene Epoch having a lower boundary at about 2.5 to 3.0 m.y. B.P.

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