COUNTRY NORTH OF THE SON AND WEST, ETC. l6l 



Kaimur sandstone through a homogeneous white shale, as 

 observed by Hinaota, Daorahra, etc., and a sub porcellanic 

 siliceous shale, which itself passes up into the overlying 

 sandstone. 



(ii) That the above mentioned shales— the homogeneous white 

 shale, the siliceous shale, etc., — die out towards the east, 

 and that there is an overlap of these by the Kaimur sand- 

 stone which thus rests directly on the Rohtas limestone in the 

 eastern parts. 



(iii) That this overlap would explain the abrupt juxtaposition of 

 a coarse rock like the sandstone of the Kaimurs and of a 

 tine-grained homogeneous deposit such as the Rohtas lime- 

 stone, an abruptness that has hitherto been held to be univer- 

 sal, and as such been insisted on as evidence of unconformity 

 between the lower and the upper Vindhyans, but which 

 appears now to be local and not universal, obtaining over 

 only parts of the area and being replaced in other parts by 

 a gradual passage from the limestone of the Rohtas into the 

 arenaceous beds above. 



(iv) That though there is thus an overlap in certain parts by the 

 Kaimur sandstone of the shales that come in immediately 

 above the Rohtas, there is no unconformity between the 

 lower Vindhyans and the upper. 



M 



( 161 ) 



