Dinoflagellate Cyst Taxonomy and Biostratigraphy of the Eocene Bracklesham Group in Southern England

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Abstract
Dinoflagellate cysts are documented from the Bracklesham Group of Eocene age at Bracklesham Bay, southern England. Stratigraphically significant species permit subdivision of the section into 3 of the assemblage zones of Bujak et al. (1980): Pentadinium laticinctum Assemblage Zone (B-2), Phthanoperidinium comatum Assemblage Zone (B-3) and Areosphaeridium arcuatum Assemblage Zone (B-4), in ascending order. The studied section at Bracklesham Bay is biostratigraphically correlated with sections at Whitecliff Bay and Alum Bay previously studied by Eaton (1976). The 3 formations, Wittering, Earnley and Selsey, belonging to the Bracklesham Group are delimited at Alum Bay, and a possibility of redefining the top of the Group is discussed. This correlation indicates that the lithostratigraphic boundaries are almost synchronous. Selected taxa, including mostly new and reattributed taxa, are dealt with. One new genus, Trivalvadinium, and 18 new spp. are described. Four species/subspecies are generically reattributed and diagnoses of 2 reattributed taxa are emended. One subspecies is raised to a specific level.

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