GEOLOGY OF CENTRAL INDIA. 



37 



The formation under consideration, I have traced east, through the 

 Ajmer and Jaypur districts, as far as Biana, where it is succeeded by 

 the sandstones of the Bkaratpur- and Agra territories, opportunities hav- 

 ing occurred to me of making observations on this large tract, both 

 on the direct route from Nasirabad to Biana, and on the route from 

 Udaypur to the same place, via Tank, the capital of Amir Khan.— The 

 Bharatpur and Agra sandstones may, very probably, be connected with 

 the formations which we have every reason to conclude occur to our north. 



The southern portion of this formation is bounded to the east, by 

 the great overlying trap formation of Mahva, which terminates a short 

 distance to the north of Ntmach; and interposed between this overlying 

 trap formation and the primitive strata, is a narrow belt of secondary 

 rocks, which skirts the trap as far as it has yet been described. 



For the distance of about thirty-six miles north of the termination of 

 the said trap, we have also secondary rocks, which are succeeded by pri- 

 mitive strata. 



The boundaries of this primitive formation in the directions of 

 Harouii, Sdgar and Bundelkliand, I have not by me the means of ascer- 

 taining.* 



With regard to the narrow belt of newer rocks above alluded to, 

 I have little to add to the excellent account given of it by Captain 



* I have only a confused recollection of Mr. Calder's paper on the Geology of India, derived 

 from the Newspaper account, and the same remark may be made regarding the excellent papers 

 of Captain Franklin, &c. read before the Society. Had I had these by me, I should have doubt- 

 less been enabled to fill up many of the blanks in this slight sketch. As it is, I am obliged to trust 

 to my own knowledge, however limited, rather than run the risk of committing mistakes by making 

 use of such imperfect recollections. 



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