Early Cretaceous dinoflagellate cysts and chlorococcalean algae from freshwater and low salinity palynofacies in the English Wealden |
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| Institution: | 1. Instituto Nacional del Carbón (INCAR-CSIC), Aptdo. 73, 33080 Oviedo, Spain;2. BOS Department, University of Oviedo, Catedrático Rodrigo Uría s/n, 33006 Oviedo, Spain;3. Museo de Ciencias Naturales de Alava, Fundadora de las Siervas de Jesús 24, 01001 Vitoria-Gasteiz, Spain;1. Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, U.P., India;2. Environment, Earth and Ecosystems, Centre for Earth, Planetary, Space and Astronomical Research, The Open University, Milton Keynes MK7 6AA, UK;3. Institute of Botany, The Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing 100093, China;1. School of Earth Sciences, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia;2. Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark;3. MGPalaeo, Unit 1, 5 Arvida St, Malaga, WA 6090, Australia;4. Natural History Museum of Utah, University of Utah, 301 Wakara Way, Salt Lake City, UT, 84108-1214, USA;5. Department of Geology & Geophysics, University of Utah, Salt Lake City, UT, 84112-0102, USA;1. University Vienna, Institute of Palaeontology, Althanstr. 14, 1090 Vienna, Austria;2. Department of Palaeobotany, NatureMuseum, im Thäle 3, Augsburg, Germany |
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| Abstract: | A number of dinoflagellate cysts occur in Wealden deposits that are considered to have accumulated in fresh to slightly brackish water conditions. Most of the forms that have been encountered in the Weald Clay Group (Hauterivian-Barremian) of southeast England and the Wessex and Vectis Formations on the Isle of Wight are described and/or illustrated in this paper. Of these, the following are new: Australisphaera longicornis sp. nov., Cassiculosphaeridia parvula sp. nov., Microdinium? fibratum sp. nov., Kallosphaeridium? inornatum sp. nov., K.? spongiosum sp. nov., Pannosiella perforata gen. et sp. nov., Vectensia varians gen. et sp. nov., Corculodinium uniconicum gen. et sp. nov., Lobionella hirsuta gen. et sp. nov. and Spicadinium akidoton gen. et sp. nov. Commonly associated with several of the cysts are chlorococcalean algae referable to the genera Botryococcus, Tetraedron, Pediastrum, Scenedesmus and Tetrastrum. Four of these are also newly diagnosed, namely Tetraedron paraincus, Scenedesmus bifidus, Tetrastrum ciliatum and T. multifilorum. |
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