Late Miocene discoasters from Sawai Bay Formation, Neill Island, Andaman Sea, India

Om P. Singh; Syed A. Jafar

doi:10.54991/jop.1995.1208

Authors

Om P. Singh Department of Geology, Banaras Hindu University, Varanasi 221005, India
Syed A. Jafar Birbal Sahni Institute of Palaeobotany, 53, University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.1995.1208

Keywords:

Discoaster, Late Miocene, Sawai Bay Formation, Andaman – Nicobar Islands (India)

Abstract

Twenty one species of discoasters are documented from the East Coast and Nipple Hill sections of Sawai Bay Formation. Discoaster pentaperforatus is proposed as new and three species are described under open nomenclature. Discoaster berggrenii and Discoaster quinqueramus are the most common forms in the assemblage. The calcareous nannofossils assemblage containing critical Discoaster species suggests assignment to Discoaster berggrenii Subzone (CN9A) of Okada and Bukry (1980), corresponding to lower part of Discoaster quinqueramus zone (NN11) of Martini (1971).