Dinoflagellate cyst biostratigraphy of the Upper Albian to Lower Maastrichtian in the southwestern Barents Sea |
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| Institution: | 1. Kingston University London, Centre for Earth and Environmental Sciences Research, School of Geography, Geology and Environment, Kingston upon Thames KT1 2EE, UK;2. Evolution Applied Ltd, 50 Mitchell Way, Upper Rissington, Cheltenham GL54 2PL, UK;3. Institute of Geophysics, Academy of Sciences of the Czech Republic, 141 31 Prague, Czech Republic;4. Statoil, 2103 CityWest Blvd Ste 800, Houston, TX 77042-2834, USA;5. Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK;6. Institute of Earth Sciences Utrecht, Budapestlaan 4, 3584 CD Utrecht, Netherlands;1. Department of Geology, Faculty of Science, Tanta University, Tanta 31527, Egypt;2. British Geological Survey Keyworth, Nottingham NG12 5GG, United Kingdom |
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| Abstract: | The present study of five wells from Upper Albian to Lower Maastrichtian succession in the southwestern Barents Sea yields the first dinoflagellate cyst-based palynological event biostratigraphy for the area. The research focuses on the Upper Cretaceous Kveite and Kviting formations due to the lack of formal palynological documentation, and enables the formation of a biozonation of greater resolution than currently achievable by micropalaeontology. Four new interval zones and one abundance subzone are described, from base upward: Palaeohystrichophora infusorioides and Palaeohystrichophora palaeoinfusa Interval Zone (intra Early Cenomanian–intra Late Cenomanian), Dinopterygium alatum Interval Zone (?intra Early Coniacian–Late Santonian), Palaeoglenodinium cretaceum Interval Zone (Early Campanian), and the Chatangiella bondarenkoi Interval Zone (Late Campanian) encompassing the Heterosphaeridium bellii Abundance Subzone (intra-Late Campanian). The zones are well correlated to existing palynological zonations from the Norwegian–Greenland Sea, where the previously described Subtilisphaera kalaalliti Interval Zone (intra Late Albian–?intra Early Cenomanian), Heterosphaeridium difficile Interval Zone (Middle Turonian to ?intra Early Coniacian) and Cerodinium diebelii Interval Zone (Early Maastrichtian) are recognised. These data also reveal the presence of three significant unconformities of Late Cenomanian–Early Turonian, Middle Campanian and Late Maastrichtian–Paleocene age. |
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| Keywords: | Dinoflagellate cysts Barents Sea Cretaceous Paleogene Zonation |
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