250 Proceedings of the Asiatic Society. [No. 3. 



ascending order ; the coal being supposed to belong to the central 

 or the Kuttra group. And this classification he applied to other 

 districts. Again on the geological map of India, recently published 

 under the sanction of the Court of Directors, by Mr. G-reenough, 

 all this immense area, stretching from the Soane to near Mundlaisir 

 in the Nerbudda, was placed under the general head of Oolitic and 

 Diamond sandstone and limestone. 



The researches of the Geological Survey of India, had extended 

 over a considerable portion of this district during the past season, 

 and although much remained to be done in working out the details, 

 as might be anticipated in so large an area, sufficient had been 

 learned to enable a few great conclusions to be drawn. It was at 

 present impossible to give all the detailed illustrations of these, 

 and they would therefore be only stated as briefly as possible. The 

 importance of them would at once be recognised by those who had 

 given any attention to these enquiries, tending as they did to modify 

 existing opinions, and to alter the colouring of all our geological 

 maps in the most marked and extended way. 



Their late investigations had shewn — -that there was good evidence 

 of a great faulting, accompanied by much disturbance mechanically, 

 and by much alteration chemically, in the rocks, (more especially to 

 the south of this fault), which passed along the main line of the 

 Nerbudda valley, along the continuation eastward of this line down 

 the valley of the Soane ; and thence across Behar, where the con- 

 tinuation of the same rocks formed the Kurruckpoor hills. 



That there was a high probability that this line of dislocation was 

 continued to the east by north, up or towards the valley of Assam ; 

 its main direction being E. 15° to 18° N., corresponding with the 

 main direction of the Vindhya range and the Khasi hill range. 



That south of this dislocation the great group of sandstones, shales, 

 &c, forming the Vindhya hills, was almost entirely absent, (unless 

 it were admitted, see below, that the highly metamorphosed rocks 

 there seen were the continuation downwards of the eame series 

 greatly altered). 



That this great group was altogether of a different character and 

 of a more ancient epoch than the beds associated with the coals of 



