Chapteh IV. — Sub-divisions of Vindiiyan Seuies. 



These recent investigations have proved the correctness of the 

 surmise that the ^ Sub-Kymore ^ series of the S one"' valley ^and the 

 ' Semri' series of Bundelkund were the same ; at the same time estab- 

 lishing* their close connexion with the formation hitherto known as the 

 Vindhyan. This connexion^ although close,, is not sufficiently so to war- 

 rant our including" both in one series. Hence the latter are now called 

 JJpj^er Vindhyan, the Semris and Sub-Kymores being distinguished as 

 Lower Vindhyan. In the middle of the Rewah^ and also of the Bundair 

 shales^ a considerable thickness of sandstone has been found dividing 

 them into two distinct bands. Hence the names " Rewah shales '^ and 

 " Bundair shales " become inapplicable, since the former include two 

 shales and a sandstone, and the latter, two shales, a sandstone, and a lime- 

 stone. Each of the three upper Vindhyan groups has, therefore, been 

 divided into an upper and lower sub-group ; but as the lower Rewah and 

 Bundair each includes two shales, it has been found necessary to give them 

 local names to avoid the confusion which would arise from speaking of, 

 say, ' upper Bundair shales ' as a part of the ' lower Bundair^ sub-group. 



The classification of the Vindhyan formation in Northern India, as 

 it stands at present, is as follows : — 



Vindhyan. 



Bundair 



Bewah 



Kymore 



JJ p p e r 

 "Upper Bundair 



Lower Bundair 



flipper Rewah 

 ■ 7 Lower Rewah 



r Upper Kymore 

 (.Lower Kymore 



, Upper Bundair sandstone. 



C Sirboo shales. 



J Lower Bundair sandstone. 

 ' ' 1 Bundair limestone. 



V^Gunoorgurh shales. 

 Upper Rewah sandstone. 



f Jheeree shales. 

 . . X Lower Rewah sandstone. 



(^ Punna shales. 



{Upper Kymore sandstone. 

 Kymore conglomerate. 

 J Bijigurh shales. 

 ' ' \ Lower Kymore sandstone. 



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