SOME DINOFLAGELLATE CYSTS FROM THE KIMMERIDGE CLAY FORMATION IN NORTHYORKSHIRE AND DORSET, UK

Four new dinoflagellate cyst species are described; Circulodinium cope i sp. nov., Rhynchodiniopsis martonense sp. nov. and Trichodinium pias eckii sp. nov. are from the Kimmeridge Clay Formation of North Yorkshi re (Kimmeridgian, Pectinatites pectinatus Zone), and Senoniasphaera cl avelli sp. nov. is from the Kimmeridge Clay Formation (Kimmeridgian, A ulacostephanous autissiodorensis Zone) in Dorset, England. These taxa have potential for use as stratigraphic markers and have also been rec orded from equivalent sediments in the North Sea, Mid-Norway and Baren ts Sea areas.