Figure 9.1. Plot showing relative frequencies of benthic foraminifera in Marion-Dufresne core MD99-2209. Left, Elphidium, and center, Ammonia and Buccella frigida plotted against core depth (cm); right: details of early Holocene (7500-6000 yr BP) trends in Ammonia and Bolivina plotted against age. Early Holocene high amplitude fluctuations in Ammonia and Elphidium signify approximately centennial-scale oscillations in salinity and possibly oxygen.

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U.S. Department of Interior, U.S. Geological Survey
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