NERBUDDA DISTRICT. 201 



In the Sohagpur country a bed of this character has been followed for 



many miles round the base of the hills which en- 

 Gorchutta Valley. 



close the Gorchutta valley (see map.) Its out-crop 



keeps at a fixed level a little above that of the valley itself, and may be 



followed in and round most of the little ravines. 



In this place was noticed an example of a second, and lithologically 



Instance of two inter- different intertrappean bed separated from the first 

 trappean beds. by a flow of trap# This upper bed j g nofc near]y 



so extensive as the lower, and its out-crop was traced only for a short 

 way along the hill side.* This lower or principal intertrappean bed of 

 the Gorchutta valley varies little in thickness, and has nowhere been 

 seen to exceed 4 or 5 feet. The extreme limits to which the same stra- 

 tum may be distinctly traced, and positively seen to extend, are 20 or 

 nearly 25 miles apart. In the adjoining part of the same district there 

 have in many places been observed certain out-crops of a rock, litholo- 

 gically identical with the above, and containing remains of apparently 

 the same shells, occurring under conditions in every way similar to the 

 Gorchutta beds, save only, that these out-crops are found at different 

 levels. None of these detached patches were traced out with sufficient 

 care to establish certainly that any one was actually vertically overlaid 

 by any other of them, but the impression produced is that there can be 

 no doubt that this is the case in many places. 



* It may here be remarked, that although this occurrence of different beds of the in- 

 tertrappean rocks, one above the other, and separated by a layer of trap, is not frequently 

 seen so very distinctly as to remove all possibility of error from the observation, yet it may 

 nevertheless sometimes thus be found : the case referred to in the text is one example, and 

 two very well marked instances occur near the station of Sagur. 



These cases, here referred to, are exhibited with all the unequivocal clearness of a dia- 

 gram, but in addition to this there abound, through the district, instances where the evi- 

 dence, although certainly less clear, is still such as to afford a cumulative weight of proof 

 quite irresistible. 



O 



