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Journal of the Geological Society of India

, Volume 93, Issue 6, pp 675–683 | Cite as

Upper Cretaceous and Early Paleogene Smaller Calcareous Benthic Foraminifera from Cauvery Basin, Southeast India

  • Abiraman GovindanEmail author
  • R. Vijayan
Research Articles
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Abstract

Smaller calcareous benthic foraminiferal fauna consists of 198 species with observed stratigraphic ranges from upper Cretaceous to early Paleogene are documented from Cauvery Basin. One species has been described as new species. This compilation is based on well cutting samples of 17 exploratory wells from sub-surface litho units Kamalapuram Formation of early Eocene — Paleocene age and the underlying Porto Nova and Nannilam Formation of Maestrichtian — Campanian age. Several representatives of Nodosariids, Gyroidinoidids and Gavelinellids were found with extended stratigraphic ranges crossing K/T boundary. Nearly 40 benthic species became extinct at the end of Paleocene as reported among deep sea benthics elsewhere. The record of high diversity of benthic species, moderately high percentage of planktic forms associated with several of deep water organic walled agglutinated benthic species indicates sediments at this time interval are deep water shelf and slope deposits in the basin.

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Notes

Acknowledgement

The author A. Govindan is grateful to Director (Exploration) ONGC Ltd., Basin Manager Cauvery Basin and Head RGL for giving an opportunity to carry out biostratigraphic studies in certain key wells of this basin. He thanks Drs. W.A. Berggren, Ellen Thomas, Laia Algret, Speijer, Scheibner and many others for sparing their publications; to Dr. R. Nagendra, Anna University for extending assistance in providing SEM micrographs for some forms and Mr. G. Karthik for bringing out the text and plates in digital format. He also thanks Drs. S. Hussain and Suresh Gandhi conveners of 26th ICMS organized by the department of Geology University of Madras in August 2017 for extending invitation to preside over the colloquium and to present this study as a keynote address.

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© GEOL. SOC. INDIA 2019

Authors and Affiliations

  1. 1.Asian Biostratigraphic Services, H-53ChennaiIndia
  2. 2.Department of Geology, National CollegeBharathidasan UniversityTiruchirapalliIndia

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