New genera and species of microplankton from a borehole through the Speeton Clay (Lower Cretaceous) of West Heslerton, Yorkshire, are described. One genus, two subgenera and seven species of dinoflagellates, and three species of hystrichospheres, are described, and a new family of dinoflagellates, the Muderongiidae, is set up.
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Neale et al. (1962) studied this question.
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