7. Summary
The author is now engaged in a detailed study of the fossil Foraminifera from the Cretaceous rocks of South India; the present paper deals with the Orbitoids found in a limestone band recently noticed near Ariyalur, in the Trichinopoly area. The abundance of these Orbitoids, together with plenty of associatedSiderolites, indicates that the containing rock is of Maestrichtian age and occupies a stratigraphical position in the Ariyalur group just below the overlying Niniyur Group (Danian). While some of the Orbitoids occurring here resemble certain species ofLepidorbitoides andOrbitocyclina already described, there are others which appear to be new. The paper gives a general account of these Orbitoids, drawing special attention to some of their interesting features. The probable significance of these in the study of the family Orbitoididae is briefly discussed.
Similar content being viewed by others
References
Barker, R. W... “Some notes on the genusHelicolepidina Tobler,”Jour. Pal., 1934,8, 3.
-- and Grimsdale, T. F. “A contribution to the phylogeny of the Orbitoidal Foraminifera with descriptions of new forms from the Eocene of Mexico,”Ibid., 1936,10.
Caudri, C. M. B... “Note on the stratigraphic distribution ofLepidorbitoides,” Ibid., 1948,22, 4.
Jacob, K. and Sastry, M. V. A. “On the occurrence ofGlobotruncana in the Utatur stage of the Trichinopoly Cretaceous, S. India,”Science and Culture, 1951,16, 6.
Narayana Rao, S. R... “Cretaceous Orbitoids from the upper Ariyalur (Maestrichtian) beds of the Trichinopoly Dt., S. India,”Jour. Mys. Uni., 1941,2, 9.
Rama Rao, L... “ More Orbitoids from the Cretaceous recks near Ariyalur,”Curr. Sci., 1953,22, 3.
—————.. “Orbitoids from the Cretaceous rocks near Ariyalur,” Ibid., 1953,22, 9.
—————.. “Siderolites from the Cretaceous rocks near Ariyalur,” Ibid., 1954,23, 1.
—————.. “Orbitoides faujasi—the first Orbitoid from the Cretaceous rocks of South India,” Ibid., 1955,24, 5.
—————.. “Recent contributions to our knowledge of the Cretaceous rocks of South India,”Proc. Ind. Acad. Sci., 1956,44, 4.
Rutten, M. G. .. “Larger Foraminifers of Northern Santa Clara Province, Cuba,”Jour. Pal., 1935,9.
Stoliczka, F. .. “Cretaceous Fauna of Southern India,”Mem. Geo. Sur. Ind. Pal. Indica, 1873,4.
Thiadens, A. A... “Cretaceous and Tertiary Foraminifers from Southern Santa Clara Province, Cuba,”Jour. Pal., 1937,11, 2.
Vredenburg, E... “Cretaceous Orbitoides of India,”Rec. Geo. Sur. Ind., 1908,36, 3.
Rights and permissions
About this article
Cite this article
Rao, L.R. Fossil foraminifera from the cretaceous rocks of South India. Proc. Indian Acad. Sci. 45, 263–281 (1957). https://doi.org/10.1007/BF03051027
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF03051027