COUNTRY NORTH OF THE SON AND WEST, ETC. 157 



There is certainly much evidence of disturbance in the beds of 

 the Rohtas limestone, often in close proximity 



Contortion of Rohtas ,11 <• -1 is • u* u i_ 



not prior to the deposi- to the base of the Kaimurs, which, however, are 



tion of the Kaimurs. ., ,. . , j tm ,, D ,. »• 



quite undisturbed. 1 hat the Kohtas limestone 

 might have been disturbed and contorted before the deposition of the 

 Kaimurs is, however, contradicted and disproved by the invariable 

 complete parallelism of the topmost Rohtas limestone with the 

 Kaimurs which has been observed wherever a clear point of junc- 

 tion has permitted an examination. 



We will now briefly refer here to a few of the sections at the 

 Sections bearing on Kaimur-Rohtas junction which bear on the ques- 



the nature of Rohtas- . c 



Kaimur junction. tion or the nature ot that junction. 



The exposures at the Kaimur-Rohtas junction were, as already 

 indicated, few and imperfect, but the following sections among them 

 were thought instructive : — 



Gursari Ghat. — Here the siliceous shales are seen to pass nor- 

 mally into the Kaimur sandstone of the scarp, 

 Gursari Ghat. The j unction oi the shales with the Rohtas is, 



however, concealed here. 



Scarp-slopes by Hinaoti. — The exposure here too is not perfect, 

 but the Rohtas limestone seems to pass into a 



Hinaoti. 



fine-grained homogeneous shale which, when 

 freshly broken, is green but turns bluish chalky white on exposure to 

 the air. Such a rock is what we should expect to meet with as a 



passage-rock from a limestone. For a little space 



Passage bed. ° r 



up the slopes, above the hst-mentioned shale, 



the ground is covered, but the shales that are exposed a little higher 



up are somewhat siliceous, and these pass above into the thick-bedded 



sandstone of the Kaimur scarp. 



Foot of the scarp slopes, north-west of Daorahra, near 



Boorgaona. — The homogeneous shale referred 

 Daorahra. ° 



to as being met with in the last-mentioned 

 locality is also exposed here. But neither the junction of the 



( 157 ) 



