SUMMARY
Four new dinoflagellate cyst species are described;
Circulodinium copei
sp. nov.,
Rhynchodiniopsis martonense
sp. nov. and
Trichodinium piaseckii
sp. nov. are from the Kimmeridge Clay Formation of North Yorkshire (Kimmeridgian,
Pectinatites pectinatus
Zone), and
Senoniasphaera clavelli
sp. nov. is from the Kimmeridge Clay Formation (Kimmeridgian,
Aulacostephanous autissiodorensis
Zone) in Dorset, England. These taxa have potential for use as stratigraphic markers and have also been recorded from equivalent sediments in the North Sea, Mid-Norway and Barents Sea areas.
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