During the earlier years of the work of the Marine Survey of India the attention of Surgeon-Naturalists was largely focussed on the biological side of marine investigtions and the results of their labours formed the basis of the numerous valuable monographs dealing with the Marine Fauni of Indian waters that have from time to time been published by the Trustees of the Indian Museum and more [...] Throughout the whole length of the Andaman-Nicobar ridge two series of deposits apart from the plutonic rocks have been recognised namely (I) The conglomerates of the North and Middle Islands and the sandstones of South Andaman Island and of the Nicobar Islands and (2) The clays and clay-marl of the Nicobars and Ritchie's Archipelago. [...] 11 as sand and if this be correct it lends colour to the view that the area is a volcanic one.' The Nicobar Islands themselves represent the line of connection between the Arakan range and the non-volcanic hill-range of Sumatra and to the west of this we find a second series of submerged peaks that appears to me to be the homologue in this region of the chain of the Mentawei Islands off the we [...] On the other hand if we admit that the subsidence of the Andaman Sea basin as indicated by the rise and fall of the mountain crest and by the presence of other gullies along the Andaman chain has been so great as this the deep portion of the gully from the edge of the shelf down to a depth of some 1 30o fathoms may be another ' drowned' gully ; but if so its position on the east side of the [...] Simultaneous with the formation of the parallel ranges of the Bur mo-Malayan arc the westernmost of which appears to have arisen in the Andaman-Nicobar section from the sea-bottom there was formed a shallow-water basin into which all the great rivers of Southern Burma and the streams on the east side of the Andaman-Nicobar region poured their effluent and out of which the water escaped through c
- Pages
- 35
- Published in
- India
- SARF Document ID
- sarf.100203
