The assemblage of palynomorphs in the bottom of a deep-sea core collected from the outcrop area of Seismic Reflector Horizon A northeast of Cat Island in the Bahamas indicates a Middle Cretaceous age (Albian or early Cenomanian). Fifty-three species of spores, pollen, and marine microplankton (acritarchs, hystrichosphaerids and dinoflagellates) are listed. Twelve species and one acritarch genus, Prismatocystis, are described as new. The assemblage dates the core amongst the oldest yet recovered from deep-sea basins.
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