Abstract
The morphology and taxonomy of the two dinoflagellate cyst taxa viz., Fibrocysta variabilis and Fibrocysts sp., described by Mehrotra and Sarjeant (1987) from the subsurface conventional core samples collected at 2703-2706 m (cc10) and 3621-3624 m (cc13) depths of Narsapur Well-1. Krishna-Godavari Basin, are discussed and reassessed. The two species are found to be the junior synonyms of Apectodinium paniculatum (Costa & Downie) Lentin & Williams 1977 and Apectodinium quinquelatum (Williams & Downie) Lentin & Williams 1981, respectively. A few other specimens comparable to A. paniculatum and A. augustum have also been described. The stratigraphic significance of the reported Apectodinium species is discussed. It is suggested that the dinoflagellate cyst assemblage at sample depth 2703-2706 is the latest Paleocene- ?earliest Eocene in age. The occurrence of Apectodinium species in infra-trappean sample at 3621-3624 m depth, dated as Maastrichtian by Mehrotra and Sarjeant (1987), indicates that this level is not older than the Late Palaeocene in age. This creates an anomalous situation because the youngest infra-trappean sediments at 3336-3339 m depth (cc 12), on planktonic formainiferal data, are dated to be latest Maastrichtian. This discrepancy creates doubt over the slide/sample numbering which needs conformation. Palaeoenvironmental significance of Apectodinium is discussed. A restudy of dinoflagellate cyst biostratigraphy of Narsapur Well-1 is recommended.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.