By A. James Powell (auth.), A. J. Powell (eds.)
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Additional resources for A Stratigraphic Index of Dinoflagellate Cysts
Woollam and Riding (1983) stated that the inception of Eyachia prisca (Fig. 8) is within the Variabilis Zone but Riding (1984b) reported this species from the underlying Bifrons Zone in North Yorkshire. Similarly, Woollam and Riding (1983) drew the range base of Parvocysta nasuta in the Levesqud Zone but unpublished BGS data from western Scotland indicates that P. nasuta and related forms first appeared in the Bifrons Zone (see Fig. 8). Woollam and Riding (1983) placed the range base of Nannoeeratopsis dietyambonis (as N.
Gocht (1970) recorded Ctenidodinium 27 ornatum and Endoscrinium galeritum, which appear in the late Bathonian and Callovian respectively in the UK. Dodekova (1975) examined dinoflagellate cysts from the late Bathonian of northeast Bulgaria. She described some taxa familiar in the UK such as Energlynia acollaris and Meiourogonyaulax relieulata plus a number of apparently endemic forms. Herngreen and De Boer (1978) reported assemblages that closely resemble their UK counterparts from the Bathonian to early Callovian of The Netherlands.
9). Sub-biozone e Age. Early Bajocian, Discites to Sauzei Ammonite Zones. Definition. The interval between the FAD of Duratrigia daveyi and LAD of Scrinioeassis weberi, and the FAD of Aeanthaulax crisp a (Figs. 9). Acanthaulax crispa (Acr) Total Range Biozone Age. Early to late Bajocian, Humphriesianum to Parkinsoni Ammonite Zones. Definition. The interval between the FAD and LAD of Aeanthaulax erispa (Figs. 9). Characteristics. The dinoflagellate cyst assemblages of the Acr Biozone are richer and more diverse than in the underlying biozones and are dominated by gonyaulacacean cysts.