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Planktonic foraminiferal assemblages were examined in 22 deep-sea cores from the Bay of Campeche in the southwestern Gulf of Mexico. Analysis of these assemblages clearly indicates 3 distinct successive biofacies during the late Pleistocene and Holocene. The biofacies are defined by variations in the relative percentages of the Globorotalia cultrata group and Turborotalia inflata. Excellent correlation can be made between these biofacies and those found in a core from the continental shelf in the northern Gulf of Mexico. These biofacies are interpreted as representing climatic changes.
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