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| Keywords: The Quarterly journal of the Geological Society of London (13206117804).jpg 222 PROCEEDINGS OF THE GEOLOGICAL SOCIETY Jan 6 <br> These fossils were discovered a few days ago by Dr Leith of the <br> Bombay Service and as he is an acute and dihgent observer and well- <br> acquainted with his subject I think before very long these beds <br> will be thoroughly investigated <br> I am preparing an account of the geology of the island but it is so <br> closely connected with that of the main land that I am loath to say <br> much upon the one until I am better acquainted with the details of <br> the other <br> I have however succeeded in the course of the past year in esta- <br> blishing some rather interesting facts relating to the trap district and <br> a sketch of these I propose at the risk of becoming very tedious to <br> relate <br> Ghauts 4000-4600 feet g <br> + <br> 24 miles <br> From this section it appears that the Ghauts are a step or scarp <br> rather than a regular mountain range Upon the scarp however <br> are many hills commonly the abrupt ends of long ranges which <br> traverse the Deccan E and W for from 50 to 300 miles B is <br> such a mountain <br> The Deccan rocks are traps chiefly greenstone and amygdaloid <br> capped with basalt Their dip is very slight and not discernible upon <br> distances of less than a mile or two It is however easterly and this <br> is shown by the occurrence of a pecuUar bed near the top of the Ghaut <br> mountains and low down on the outlying mountain C above Poonah <br> AAer extending from two to three hundred miles eastward or inland <br> the trap is found to overlie gneiss and other metamorphic as well as <br> some later rocks <br> The rocks of Bombay and the western margin of the Konkun all <br> dip west and at a much higher angle This led me to suppose that <br> their origin would be in the centre of the anticlinal and to seek it <br> not as some have done in the interior of the peninsula but in the <br> middle of the Konkun ; and here at A I found a broad band of very <br> well-marked craters extending nearly N and S parallel therefore <br> to the Ghauts and which is important to any general theory of <br> India ranging with the Laccadive and Maldive band of islands <br> Lateral bands of volcanos seem to have been here and there given <br> off for short distances producing bays in the general outline of the <br> Ghauts of which the most remarkable is that nearly E of Bombay <br> towards Jooneer Basaltic dykes are numerous parallel both to the <br> main and subordinate bands <br> The aspect of these volcanos shows that they have been submarine <br> land have been covered up by other igneous rocks ; in fact that they <br> were the nuclei of more lofty volcanos now in great part removed 36932959 113687 51125 Page 222 Text v 3 http //www biodiversitylibrary org/page/36932959 1847 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 3 1847 Geology Periodicals Smithsonian Libraries bhl page 36932959 dc identifier http //biodiversitylibrary org/page/36932959 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-17 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13206117804 2015-08-26 12 53 45 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1847 Photos uploaded from Flickr by Fæ using a script | ||||
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