COUNTRY NORTH OF THE SON. 



137 



Again, supposing denudation to reach the line AA, we will get 

 at B conditions exactly answering to those observed at Tal. If 

 besides we imagine, to the lefthand side of the diagram, a very 

 slight syncline, or small depression in the original floor of deposi- 

 tion, the similitude will be complete ; for this would give rise to a 

 small outlier of the Talchirs, just as occurs north of Tal. 



The fault shown on the diagram as older than the Talchirs is not 

 needed, as it was imagined merely for the purpose of making the 

 explanation clearer. An additional fault is, however, needed to the 

 right of the diagram in order to sufficiently lower the level of the 

 Mahadevas, as these abut against the boundary a very short distance 

 away from this point, at Kachinar, 



The general structure of the section at Tal would therefore be 

 thus : 



Fig. 14. Section at Tal. T, Talchir ; 

 B, Barakar j G, Gneiss. 



The existence of the Talchir outlier combined with the fact that 

 the Mahadevas themselves are faulted gives a minimum value for 

 the throw of the fault, looking upon the several step-faults as one ; 

 the value should be estimated as at least equal to the thickness of 

 the Talchirs and Barakars, plus several hundred feet to account for 

 the thickness of Mahadevas affected. 



East of the contact just described, the rocks are concealed by 

 alluvium. At Kachinar, in the river that flows from Maraich just 

 above its confluence with the Kandas, some Barakar beds are seen 

 dipping io° W. of N. at 23 . The hills east of Kachinar consist of 

 Mahadevas, and it is these that are exposed in the same river higher 



( 137 ) 



