Studies of foraminiferal abundance and diversity in these sediments show several general biofacies patterns, including abundant miliolids in perimeter areas of the bay, an Elphidium facies in the central inner area of the bay, and an Archaias facies in the southeastern area of the bay. Areas of mud matrix characterize the first two biofacies, whereas non-skeletal grains correlate with the Archaias facies. Foraminifera are from 10 to more than 50 times as abundant as ostracods throughout most of the bay. Deep-water cores off the Batabano platform show high percentages of displaced platform foraminifera within the benthic faunas.

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