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Age of the earliest transgressive event in the Krishna-Godavari Basin, India: evidence from dinoflagellate cysts and planktonic foraminifera biostratigraphy

Authors
  • Mishra, Ashish Kumar1
  • Malarkodi, Nallamuthu2
  • Singh, Arun Deo3
  • Babu, Dinesh4
  • Prasad, Vandana1
  • 1 Birbal Sahni Institute of Palaeosciences, Lucknow, India , Lucknow (India)
  • 2 Jnanabharathi Campus, Bangalore University, Bengaluru, 560056, India , Bengaluru (India)
  • 3 Banaras Hindu University, Varanasi, 221005, India , Varanasi (India)
  • 4 Oil India Limited, Kakinada, India , Kakinada (India)
Type
Published Article
Journal
Journal of Palaeogeography
Publisher
Springer Singapore
Publication Date
Feb 07, 2020
Volume
9
Issue
1
Identifiers
DOI: 10.1186/s42501-019-0052-4
Source
Springer Nature
Keywords
License
Green

Abstract

A combined biostratigraphic study of dinoflagellate cysts and foraminifera was carried out on Early Cretaceous subsurface well cutting sediments from well A (DNG) (2800–2746 m depth) from the Krishna-Godavari Basin, India. The last appearance datum of marker species of dinoflagellate cysts and planktonic foraminifera was considered for the construction of the biostratigraphic framework. The study shows dominance of Early Cretaceous marker dinoflagellate cysts Cassiculosphaeridia magna, Cribroperidinium perforans, Hystrichodinium voigtii, Kleithriasphaeridium eoinodes, and planktonic foraminifera Hedbergella aptiana, Hedbergella mitra, Hedbergella praelippa, Hedbergella tardita, Microhedbergella miniglobularis and Hedbergella mitra species. In addition to this, the dinoflagellate cyst data were compared with the dinoflagellate biozones of Austral and Tethyan provinces. Based on earlier micropalaeontological records from the Krishna-Godavari Basin and the present study, a latest Barremian-early Aptian age has been determined for the earliest marine transgression in the Krishna-Godavari Basin. The early marine incursion during late Barremian-earliest Aptian in the Krishna-Godavari Basin compared to Albian age in Cauvery Basin suggests the opening of east coast from north to south.

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