334 GEOLOGICAL RELATIONS OF THE ROCK SYSTEMS 



We have purposely avoided complicating the argument derived from 

 our knowledge of these rocks in Bengal and in part of Central India, by 

 any reference to other districts in India, which we have not ourselves 

 been able to visit, however much such a process might be calculated to 

 throw light on the questions we have discussed. One of these districts 

 is the Nagpur country, so admirably described by Messrs. Hislop and 

 Hunter. It is clear from the papers of these observers themselves that 

 much yet remains to be done in making out the physical relations of the 

 different groups before we can admit the reasonings they have founded 

 on a consideration of fossils obtained at great distances — and from beds, 

 which are only supposed to belong to the same sub-division of their clas- 

 sification. We may very briefly remark, that the upper group (A) of 

 Mr. Hislop's series is very probably synonymous with our Mahacleva 

 group. In these beds in Nagpur, no fossil plants with the exception of 

 a few stems of trees in situ have been found, excepting in rolled blocks 

 of previously existing rocks, imbedded in these upper sandstones. This 

 fact in itself proves that there had elapsed a long interval of time and 

 that great changes in the physical conditions of the district had occurred, 

 subsequently to the deposition of his second group (B) and that the two 

 are therefore, in Nagpur as elsewhere, quite unconformable. In this 

 group (B) I think, it will be found that beds representing in part our 

 " Rajmahal" series, and in part our " Damuda" series have been brought 

 together. I judge so from the curious admixture of fossils which in 

 the districts we have been more particularly speaking of are found, so 

 widely distinct. The red shaly beds, and argillaceous strata of Mr. 

 Hislop's group C. may be representative of our Talcheer group. From 

 Mr. Hislop's own account they w T ould appear to be unconformable 

 to the group B. The only fossils found in these are stated to be a rep- 

 tilian (?) foot mark, traces of worm-like animals, and a supposed 

 Phyllotheca. 



I do not refer to his group D, including crystalline limestone, &c. 



