Figure F14. Overview of dinocyst assemblage changes, Hole U1356A. Oligocene and Miocene nonprotoperidinioid dinocysts comprise the oceanic oligotrophic genera Impagidinium and Batiacasphaera, as well as Operculodinium. Chemical index of alteration (CIA; see “Geochemistry and microbiology”) exhibits a large decline coeval with the onset of protoperidinioid-dominated dinocyst assemblages. Dotted lines = interval shown in Figure F15.
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