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G. G. Vaz ¹, N. R. Biswas ¹, P. Prabhakara Rao ¹

Affiliations
1 East Coast Operations-II, Marine Wing, Geological Survey of India 41, Kirlampudi Layout, Visakhapatnam - 530 017, IN

Abstract

A well preservedlamellibranch fossil cast belonging to Genus:Crassatella of Cretaceous - Miocene age and fossil bearing phosphatic rock pieces were recovered by grab sampling from the continental shelf edge, off Madras. Phosphatic rock pieces contain Globigerina linaperta of Upper Paleocene - Lower Eocene age. Cretaceous - Eocene sedimentary sequence of Cauvery basin is occurring on the seabed in continental shelfedge, off Madras.

Keywords

Palaeontology, Cretaceous-Eocene, Continental Shelf, East Coast.

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P. Vijaykumar ¹, G. G. Vaz ¹

Affiliations
1 East Coast Operations II, Marine Wing, G.S.I., 41, Kirlampudi Layout, Visakhapatnam - 530023, IN

Abstract

Euhedral crystals of gypsum in association with pyrite aggregates and corroded planktonic foraminiferal tests occur in silty clay in a deep sea core off Madras. The environment responsible for the origin of gypsum crystals is discussed. Evidences indicate an authigenic origin for the gypsum crystals.

Keywords

Gypsum, Marine Geology, East Coast.

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G. G. Vaz ¹, E. V. Nair ²

Affiliations
1 East Coast Project-II, Marine Wing, GSI, Visakhapatnam, IN
2 West Coast Project- I, Marine Wing, GSI, Mangalore, IN

Abstract

Tale valley is a NE-SW oriented oval shaped basin situated between altitudes 2278 and 2870m above MSL in Lower Subansiri District of Arunachal Pradesh. Upper Quaternary sediments measuring about 11.85 m unconformably rest over the crystallines in the valley sides of Karing nala, the main tributory in the valley. Radiocarbon dating (¹⁴C) of peaty clay in the lower part of the sequence provides 25400± 750 yrs. B.P. for the sediments, equivalent to Upper Pleistocene age. Lithology suggests glacio-lacustrine and glacio-fluvial environment of deposition.

Keywords

Tale Valley, Upper Pleistocene, Karing Formation, Arunachal Pradesh.

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