Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

A. Govindan ¹, J. N. Rao ², E. Senthivel ¹

Affiliations
1 Asian Biostratigraphic Services, H-53, Central Avenue, Chennai - 600 080, IN
2 H. M. G. D. V. P. A and AA basins, O.N.G.C. Ltd.Jorhat, Assam, IN

Abstract

Subsurface sediments from a well in Ramnad sub-basin have revealed the presence of the foraminiferal genus Orbitoides from the Upper Cretaceous sequence. Detailed morphornetric analyses of these specimens have confirmed the record of Orbitoides tissoti (Schlumberger), a species known from the stratotype Campanian exposed at Aubeterre - Sur Dronne section, France. This is the first record of the genus Orbitoides from Cauvery Basin as well as from the Indian region. The chronostrati graphic value of the species of Orbitoides in the Upper Cretaceous biostratigraphy has been stressed.

Keywords

Orbitoides tissoti, Campanian, Cauvery Basin, Southeast India.

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