350 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



flattened summits 

 orm we see, from 



t5 



CO 



h^ o 

 « o »- 



are the tops of trap-hills, which stretch, in the 

 our present position to the coast of the Arabian 

 Sea ; and these massive eminences are 

 granitic hills which rise up in the manner 

 that meets our eye, at various distances 

 from each other, from the place where we 

 stand to the Bay of Bengal. The inter- 

 mediate hills and plains, which m front 

 fill up the foreground, are formed of the 

 S dolomite and shale of Korhadi, and the 



•s sandstone of the basins of the Kanhan 



•I and Kolar. 



j^"^ I From our elevated station we are thus 



enabled to command a prospect of twenty 

 miles in every direction, and the forma- 

 tions that we can trace within that range 

 make up an exact miniature of the geo- 

 logy of our whole area. Nay, were we 

 to go down the hill and walk around its 

 base, in the descent and circuit, which 

 might all be accomplished in twenty 

 minutes, we should meet with almost 

 every rock that is to be found between 

 Bombay and Kattak. 



The geology of our area must at one 

 time have been extremely simple. Its 

 principal feature was then sandstone, 

 associated vdth shale and limestone. But 

 now other two formations are discovered 

 on the arena, and these seem on the sur- 

 face as if they had been two huge ice- 

 bergs, which approached each other in 

 frightful collision, crushing the sandstone 

 between them, and allowing the frag- 

 ments to slide out at either end, and 

 scattering them here and there over their 

 own bulk. Or, to speak in language 

 more precise, the sandstone formation, 

 which once occupied the whole space that 

 we have chosen for description, is now 

 covered up by trap on the west, and 

 broken up by granite on the east, leaving 

 only a small diagonal stripe running 

 through the centre, which, after being 

 interrupted at the north-west and south- 

 east, increases in these directions to a 

 broad expanse, while a few detached por- 

 tions, formerly continuous with it, appear 

 in the body of the trap and granite. It 

 is the juxtaposition of trap, sandstone. 





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