GENEEAL RELATIONS OF ROCK GllOUPS. 31 



I cannot conclude without pointing out the remarkable coincidence 

 of a boulder bed, which from the description* must somewhat resemble 

 that of the Talchii- group, at the base of the Karoo beds of South 

 Africa, in which beds several fossils are found, which are also found in 

 different groups of the Indian plant-bearing series, especially Glossopteris, 

 Bicynodoii and Palmommia; and suggesting that when the geology of 

 Natal is better known, other members of them, besides the cretaceous 

 formations, may be found to correspond to the rocks of India, The 

 connexion was pointed out by Dr. Oldham many years ago, but appears 

 to have escaped the attention of the geologists who have recently added 

 so much to our knowledge of South African geology. 



JDamudas, Kdmthi Beds, and PancJiets. — The beds which, in treat- 

 ing of the rocks of Nagpiir, I have called Kamthi beds, have, for some 

 years past, been generally classed as Damiidas. This name was 

 adopted by Mr. Hislop, and the question of the connexion of the beds 

 with the typical Damudas of Bengal was fully argued out by Mr. 

 Hislop and by Sir Charles Bunbmy, in the Quarterly Journal of the 

 Geological Society for 1861, vol. xvii, pp. 341, 345, &c. 



I certainly went to Nagpur with the impression that not only 

 the rocks were Damudas, but that their identity with the Beno-al beds 

 had been established, on the best authority, by a comparison of the 

 fossils. And even now I am not sure to what extent they should be 

 removed from the series. 



In mineral character, however, all the Nagpur, and the greater part 

 Mineral character of °f ^^^ Ch^-^^i, rocks, differ widely from the lypical 

 ^^™''''^- Damudas of Bengal and the Narbada vaUey. The 



latter consist of coarse soft felspathic sandstones, rarely conglomeritic, 

 except towards the base, with brown, blue, and black shales, — the 

 latter frequently highly carbonaceous and with beds of coal. Clay iron 

 ore is rarely absent amongst them over any large area. The Kamthi 



* Q. J. G. S., 1871, vol, xxvii, p. 58. 



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