Anniversary Address. 27 



The conclusion is, tliat the open valleys of Eewah are not 

 altogether due to atmospheric and river action ; the whole must 

 have been under water when these diamonds were washed into 

 their position. "If," says the author, "the diamond is but a 

 pebble in the conglomerate," then, on the other hand, there is 

 every chance of further discoveries, " since quartz grains of 

 similar size with the diamonds are abundant, and there are other 

 sufficient proofs of the recent submergence of the country. 

 (p. 75.) 



In the above references, there is not as clear a relation as was 

 given in connection with Brazil ; but the geology of the region 

 is not in some respects so settled as to determine exactly where, 

 in relation to other countries, the Yindhyan rocks of India 

 belong. Enough, however, has been produced to show that the 

 Mahadeva beds are younger than the Damoodah, which clearly 

 correspond with our own Tipper coal-measures, and that the 

 Yindhyan beds were faulted and elevated and denuded before the 

 deposition of the Talcheer beds that are still lower than the 

 Damoodah. 



Under such circumstances it follows that there is probably no 

 very close connection between diamond beds in India at distant 

 localities, and very little to justify the supposition that all, if 

 any, of the Indian diamond deposits can be exactly synchronous 

 with older Pliocene. 



I have not yet mentioned two very important and interesting 

 memoirs, by Messrs. Hislop and Hunter, published in the 10th 

 and llth volumes of the Quarterly Journal of the Greological 

 Society, on the geology of the Nagpur territory. Differing in 

 opinion from them as to the age to which they assign what they 

 term the great Jurassic formation, which extends over enormous 

 areas and comprises the Coal-fields of Central India and Bengal, 

 I would still accept their statements with the greatest respect. 

 They regard the base of the Peninsula as formed of gneiss, granite, 

 sienite, pegmatite, mica schist, and quartz ; but these are not all 

 of anterior date to the sedimentary fcrmations. 



Over these occur the Coal-bearing rocks, the upper part of 

 which are the sandstones, partly transmuted, which have been 

 already alluded to, and which other authorities regard as the 

 source of the diamond. 



