Early to Middle Cretaceous dinoflagellate cysts from the Periyavadavadi Shallow well-1, Cauvery basin,India |
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| Affiliation: | 1. Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia;2. Vertebrate Zoology Department, Saint Petersburg State University, Universitetskaya Emb. 7/9, 199034 Saint Petersburg, Russia;3. Geological Institute of the Russian Academy of Sciences, Pyzhevsky Lane 7, Bld. 1, 119017 Moscow, Russia;1. Department of Geology, Faculty of Science, Assiut University, 71516, Assiut, Egypt;2. Department of Geology, Faculty of Science, Cairo University, 12613, Giza, Egypt;1. Instituto de Geociencias, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Goncalves, CEP. 91509-900 Porto Alegre, RS, Brazil;2. Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow 226 007, India;1. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090 Novosibirsk, Russia;2. Novosibirsk State University, ul. Pirogova 2, 630090 Novosibirsk, Russia |
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| Abstract: | Assemblages of Lower-Middle Cretaceous dinoflagellate cysts are described from the sediments of India for the first time. They were obtained from subsurface sediments of Periyavadavadi Shallow well-1, Cauvery basin. Twenty-seven morphotypes, belonging to at least eighteen genera, occur in these sediments, the majority showing close morphological comparability with taxa described earlier from Australia and Europe. One new subspecies, Cyclonephelium distinctum subsp. laevigatum, is proposed; other new taxa are described but, since meagrely represented, are not named. The generic diagnosis of Aprobolocysta Duxbury, 1977 emend. Duxbury, 1980, is again revised. The assemblages, along with evidence from spores and pollen published earlier by Venkatachala & Sharma (1974), indicate a Valanginian to Aptian age for the sediments studied. |
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