By A. James Powell (auth.), A. J. Powell (eds.)
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Extra info for A Stratigraphic Index of Dinoflagellate Cysts
Characteristics. The diverse dinoflagellate cyst assemblages are reminiscent of the underlying biozone except for the distinctive presence of Wanaea fimbriata. Common taxa include Compositosphaeridium polonicum, Liesbergia scarburghensis, Mendicodinium groenlandicum, Rhynchodiniopsis cladophora, Scriniodinium crystallinum, Sentusidinium spp. and Stephanelytron spp. Gonyaulacysta jurassica subsp. jurassica appears at the base of this biozone. , Surculosphaeridium spp. and Jurassic dinoflagellate cyst biozonation Tubotuberella spp.
Characteristics. 6. These important datums form the basis of the subdivision of this biozone into five sub-biozones. Nannoeeratopsis gracilis is not confined to the Ngr Biozone but it is consistently the dominant element of the dinoflagellate cyst assemblages. Species of Nannoceratopsis, particularly N. gracilis, have been considered to be euryhaline (Riding, 1983) and thus have a wide palaeogeographical distribution and frequently occur as mono generic associations. , 1987). Within this interval a significant increase in the diversity of the dinoflagellate cyst assemblages occurs, including the inception of the 'Parvoeysta suite' (Riding, 1984b) and important morphological features such as paratabulate gonyaulacacean forms.
_ '" N -;..... c. Late (pars) Oxfordian Middle/Mid ... Chytroeisphaeridia chytroeides Aldorfia dictyota dictyota Adnatosphaeridium caulleryi Ctenidadinium ornatum Gony. ella aemula Pareodinia prolongata Liesbergia scarburghensis Gony. eflandrei Wanaea thysanota Chytroeisphaeridia cerastes Limbodinium absidatum Gonyaulacysta centriconnata Energ lynia acollaris Meiourogonyaultvc caytonensis Grp. '> ....