Journal of the Geological Society of India

, Volume 75, Issue 6, pp 851–863 | Cite as

Foraminifera from the early Danian intertrappean beds in Rajahmundry quarries, Andhra Pradesh

  • N. Malarkodi
  • G. Keller
  • P. J. Fayazudeen
  • U. B. Mallikarjuna
Article

Abstract

Intertrappean beds exposed between upper and lower traps of the Government and Sunnamrayalu quarries of Rajahmundry were analyzed based on benthic and planktic foraminifera, ostracodes and algae observed in thin sections. Planktic foraminifera indicate deposition occurred in the early Danian Parvularugoglobigerina eugubina (P1a) zone shortly after deposition of the lower trap flows. The most diverse planktic assemblages were deposited in limestones of the middle intertrappean interval and indicate an upper P1a age, or subzone P1a(2), as marked by the co-occurrence of P. eugubina, Globoconusa daubjergensis, Parasubbotina pseudobulloides and Subbotina triloculinoides. Reworked late Maastrichtian planktic foraminifera are common in a limestone interval and suggest erosion of uplifted Cretaceous sediments. Benthic foraminiferal assemblages indicate deposition occurred predominantly in shallow inner shelf to brackish environments. Similarly, ostracodes indicate variable environments ranging from inner neritic to brackish with fresh water influx, as also indicated by the presence of fresh water algae. These data confirm an overall deepening from restricted shallow marine to estuarine, lagoonal and finally open marine conditions followed by abrupt emersion and paleosoil deposition prior to the arrival of the upper trap flows at or near the base of C29n.

Keywords

Foraminifera Ostracodes Danian Intertrappean Rajahmundry Andhra Pradesh 

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Copyright information

© Geological Society of India 2010

Authors and Affiliations

  • N. Malarkodi
    • 1
  • G. Keller
    • 2
  • P. J. Fayazudeen
    • 1
  • U. B. Mallikarjuna
    • 3
  1. 1.Department of GeologyBangalore UniversityBangaloreIndia
  2. 2.Department of GeosciencesPrinceton UniversityPrincetonUSA
  3. 3.Civil Engineering Department, Geology DivisionIslamiah Institute of TechnologyBangaloreIndia

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