136 



GEOLOGY OF THE SON VALLEY, ETC 



area then becomes one of sedimentation, the figure of the section 

 will be thus: (Fig. n.) 



-^^5 



Fig. 11. 



If the effect of the final cycle of erosion is to remove the rocks 

 as far as the line AA, the conditions of the boundary will be 

 analogous to those observed in the Kandas at Tal. 



Yet the case is not quite similar, for the beds exposed should be 

 the lowermost ones, the Talchirs, while they present the characters 

 of the Barakar sandstone. Instead of supposing the erosion to come 

 to an end we imagine the movement along the fault to continue, or 

 a parallel fault to originate : (Fig. 13.) 



Fig. 12. 

 This, too, may become partly eroded before the new sediments 

 have filled the depression, and the next set of conditions may be 

 as in Fig. 13. 



( 136 ) 



Fig. 13. 



