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Download A Stratigraphic Index of Dinoflagellate Cysts by A. James Powell (auth.), A. J. Powell (eds.) PDF

By A. James Powell (auth.), A. J. Powell (eds.)

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Extra resources for A Stratigraphic Index of Dinoflagellate Cysts

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13). Sub-biozone a Age. Early Kimmeridgian, Ammonite Zone. 43 Cymodoce Definition. The interval between the FADs of Cribroperidinium longicorne, Oligosphaeridium patulum and Systematophora daveyi and LADs of Nannoceratopsis pellucida and Scriniodinium crystallinum, and the FADs of Perisseiasphaeridium pannosum, Subtilisphaera? inaffecta and S? paeminosa and LAD of Endoscrinium galeritum (Figs. 13). Sub-biozone b Age. Early Kimmeridgian, Mutabilis Ammonite Zone. Definition. The interval between the FADs of Perisseiasphaeridium pannosum, Subtilisphaera?

Beaumontella lang;; may be encountered in Sub-biozone b low numbers throughout the biozone and is the only dinoflagellate cyst presently known to Age. Early Pliensbachian, Jamesoni to occur in sub-biozone b in Britain. Davoei Ammonite Zones. Comments. The biozone and sub-biozones are as defined by Woollam and Riding (1983). Liasidium varia bile appears to be an excellent marker for the late Sinemurian of northwest Europe (Riding, 1984a; Williams and Bujak, 1985; Woollam and Riding, 1983). Morbey (1978) and Morbey and Dunay (1978) .

Occisucysta balios, Pareodinia ceratophora, Scriniodinium inritibile and Senoniasphaera jurassica. Acmes of Cribroperidinium longicorne have been reported by Riding and Thomas (1988) from the Wheatleyensis Zone of Dorset and by Barron (1989) from the Scitulus Zone of northeast Scotland. An acme of Oligosphaeridium patulum was also reported by Riding and Thomas (1988) from the Hudlestoni Zone of Dorset. , Gochteodinia mutabilis, Mendicodinium groenlandicum, Sirmiodinium grossii and Tubotuberella apatela are often present.

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