Description: Coccoliths circular to sub-circular with >12 slits, length >4μm. Abundant in the Late Pliocene, but well-developed, large, circular forms only occur in the Pleistocene.
Remarks:
Range: NN15 to 19.
Synonym: Emiliania annula (Cohen, 1964) Bukry, 1971 [Coccolithus].
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