46 MALI-ETj VINDHYAN SERIES. 



quartzite associated with mica-schist makes its appearance in the area of 

 the more recent formation. 



The northern boundary is also natural, being formed by the junction 

 of the lower with the upper series. The junction is, of course, parallel with 

 the strike, and the latter, making a sudden bend to the south near Belheri, 

 ' brino>s the boundary at right angles against the Nerbudda fault, which 

 thus sinks the lower series completely out of sight. Its only reappearance 

 to the westward is north-east of Kuttungee, where it occupies the centre 

 of a great anticlinal bend, marked on both sides by ridges of Rewah 

 sandstone. 



The best sections exhibiting the junction of the upper and lower 



Vindhyans are to be found in the Doorgowtee val- 



Relations to Upper J ° 



Tindhyans. Jey and its lateral gorges. In all cases the Kydiore 



sandstone rests, as far as the individual section is concerned, perfectly con- 

 formably on the Eotas limestone, which there occupies the highest place 

 in the lower series. Thus in one place where the junction is exposed for 

 150 yards, a particular bed in the limestone, about 8 inches beneath tbe 

 Kymores, is traceable all along, OtheiAastances might also be given. This 

 ^Aridence, however, being somewhat of a negative character, cannot be taken 

 as conclusive with regard to the whole area, and there is some reason, on the 

 ■other hand, to suppose a slight unconformity. It will have been observed 

 that the shales. No. 10, and limestone above, are very inconstant in their oc- 

 currence, sometimes attaining a thickness of 300 and 400 feet, while absent 

 entirely in other places. The explanation of such capriciousness that first 

 sugo-ests itself is a slight disturbance and denudation anterior to the de- 

 position of the Ky mores, and it is quite possible that such is the true one. 

 But, on the other hand, a tendency to lateral alteration in mineral charac- 

 ter has often been observed in the upper beds of the series, by which 

 strata, which in one locality are limestone, change to shale in another. 

 The idea that the variable occurrence of the shales. No. 10, and limestone, 

 (11) should be accounted for in this manner, is strengthened by the fact 

 ( 4G ) 



