158 GEOLOGY OF THE SON VALLEY, ETC. 



Rohtaswith this shale, nor the passage of this rock into the silice~ 

 ous shales and sandstones above, is traceable here. 



Scarp-slopes, north-west of Majgama — The toot of the spurs is 

 occupied by the Rohtas limestone. A little 



Majgama. 



way up ( after a short blank) a finely laminated 

 soft shale, white grey to blackish, is seen (the shale is occasionally 

 blackish enough to look carbonaceous). This soft shale passes upwards 

 into a shale somewhat harder, the color being yellowish to brownish 

 grey, with a faint approach to porcellanic look. 1 Beyond this 

 point a talus of sandstone obscures the section, but the thick-bedded 

 sandstone of the scarp is close above. 



Reiwas Hill (4^ miles north by east of Rampur). At the south- 

 eastern extremity of this hill, although the exact 

 and precise point of junction (Kaimur-Rohtas) 

 is not to be seen, the uppermost Rohtas limestone as well as the 

 shales above are well exposed. Just above the uppermost limestone 

 exposed, a few feet of blank section, covered over with shale-debris, 

 intervenes, beyond which occurs a laminated shale, somewhat blackish 

 in places and very slightly, if at all, siliceous. This shale is 

 succeeded by some more shales which are earthy and somewhat 

 porcellanic. Over these comes in the thick-bedded sandstone (the 

 dip of the limestone as well as of the shales above is N. 15 W. r 

 at ii°). 



These sections, we take it, indicate that there is no physical 

 .. break in the shape of abrupt change in the 



Inference from the r r & 



above sections. lithological character of the rocks observable as 

 one passes from the Rohtas to the beds above ; but that, on the other 

 hand, the indications all point the other way, namely, that there is a 

 physical continuity in the passage from the Rohtas into the Kaimur 

 beds above. 



The following sections are taken from the eastern parts of the 



Sections from the area : 



eastern parts of the area. 



1 It may be added here that south of Seranja, near Mirgaoti (L*t. 24 09', Long. 8i° 07'! 

 we find a limestone passing down through a white chalky rock into a porcellanic shaly rock^ 



( >5« ) 



