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160 On the Granite formation 



No signs of disruption or disturbance are visible any where ; 

 and that the flat tables have not been displaced, is made 

 visible by some waving veins of a lighter coloured portion 

 of the rock, which run vertically down through several of 

 the horizontal courses. The summit is nearly quite flat, 

 and is covered with soil on which grass and large trees are 

 growing, and several blocks of common granite are lying about 

 on the surface. The rock is the common grey hornblende 

 granite, varying much in aggregation and composition ; being 

 in some parts a nearly perfect syenite, and in others a soft 

 porphyritic rock. The structure of the seamed parts I was 

 unable to examine minutely, from their being inaccessible. 

 About the locality there was nothing remarkable to des- 

 cribe, and the only uncommon minerals found, was a piece 

 of schistous white sandstone, (or fine grained white peg- 

 matite,) interlaminated by a conforming thick vein of black 

 syenite. 



Situation and Rocks associated. 



The manner in which the granite hills rise from the 

 plains which surround them is most striking ; for the 

 plains being nearly quite flat, the appearance is exactly 

 like that of rocky islands, with abrupt slopes rising above 

 the surface of the sea. There is no gradual alteration of 

 the slope, so as to blend gradually with the plain; there 

 is no change in the structure of the hill, nor in the com- 

 position of the soil of the plain in the vicinity of the hill ; 

 but the plain preserves its level, and the slope of the granite 

 its angle of elevation, until the two meet abruptly, and 

 the granite is hidden by the soil which surrounds it. These 

 plains (except in the red marie formation of Mysore), are 

 invariably formed of confused jumbled series of beds of 

 gneiss, friable gneiss, white quartz, syenite, greenstone, 

 kunkur, wacke, and pegmatite, in the most utter confusion, 

 not shewing any signs of disturbance ; but such as to defy 



