Indian Science Congress Association. Silver Jubilee Session 1938. an Outline of the Field Sciences of India

Several other illustrations are reproduced by kind permission of the Director-General of Observatories the Editor of the Geological Magazine the Inspector-General of Forests the Editor of the Indian Forester the Imperial Council of Agricultural Research and the Home Department of the Government of India. [...] At or about the same period the gradual upheaval of the central Asian plateau caused the obliteration of the northern part of the Indian Ocean so that to-day the only traces of its original vast extent are to be found in the Gulf of Oman and the Persian Gulf and the great lakes of Asia the Caspian Sea the Aral Sea etc. [...] In the Rod Sea the bottom deposit is of a different type in the Pteropod ooze northern and southern areas ; in the northern part the deposit is a yellow mud whereas in the southern region the colour changes to brown and here the inflowing etirrent from the Gulf of Aden carries in large numbers of Pteropoda which are killed off in thousands by the sudden change in the character of the water and [...] In the deepest areas of all and especially in the Arabian Basin Red Clay to the north-east of the Carlsberg Ridge the Indo-Australian Basin in the south-east part of the ocean between the Mid-Indian Ridge on the west and the Malay arc and Australia on the east and in the South-Australian Basin the floor is covered with Red Clay and a patch of this deposit is also found in the Madagascar Basin. [...] combine to form the great Agulhas current part of which flows round the Cape of Good Hope into the Atlantic and joins the Benguela current and the south-east Trades of that ocean and the rest swings to the south-east and meets with and joins the Wrst-wind Drift of the ' Roaring Forties '. During the norteast monsoon there is a strong flow of water from the Pacific to the Indian Ocean through t