TRIVIKARY, a village in the South Arcot district, about 13 miles 1V.N.W. of Pondicherry. It has extensive fossil trees, silicified, around what seems to be a crater. About three or four utiles E. and N.E. of Vcrdur, a village 10 miles W.N.W. of Pondicherry, are extensive fossiliferous lime stone strata, containing molluscs and fishes of the Squaloid family and Placoid order. Similar strata occur at Paroor, 10 miles W. of Verdachel lum, and at Ootatoor, 25 miles N.W. of Triehino poly. The deposits at the three places, Verdur, Paroor, and Ootatoor, are connected with each other geologically. The country around Trivikary consists of a coarse sandstone, containing remains of large trunks of fossil trees, to.the westward of which the primitive gneiss formation of the Penin sula appears, and to the east extensive cretaceous beds, with numerous remains of ammonites and other chambered shells which stretch for some distance towards the sea, after which the sand stone again appears, and continues until covered by the alluvial forniation of the valley of the Tembakam-nala, which reaches to the sea-shore at Pondicherry. In some very well-defined sectiuns
of the sandstone rocks in deep gullies cut by the supplying streams of the Usatari tank, four miles to the east of Pondicherry, are clear indica tions of cretaceous fossils underlying the sand stone. The Usatari sandstone beds, instead of being under the cretaceous rocks, rest very un conformably upon them. A careful comparison between the formations at Trivikary and those at Usatari has shown that the Trivikary sandstones are identical with those at Usatari, therefore newer than the cretaceous beds, and unconforin able to them.