128 GEOLOGY OF THE SON VALLEY, ETC. 



disturbance of the sandstones of the plateau is against their being 

 ascribed to the red shale series. 



The mode of occurrence, induration and general appearance of 

 these beds is so near those of the Kharara sandstones of the Kharara 

 hill, that there would, on this ground alone, be good reason for 

 attributing them to the same age. The rock is more uniformly a 

 sandstone ; the lowest bed often contains many large imperfectly 

 rounded pebbles of quartzite, but above this and over most of the 

 surface of the hill the prevailing rock is a moderately fine-grained 

 felspathic sandstone, somewhat micaceous, mostly white or nearly so, 

 though not infrequently tinged with red and at times passing into a 

 dull red sandstone. 



West-south-west of Dadri village there is a peculiarity in the 

 boundary which is interesting as an indication of the nature and 

 extent of the denudation which preceded the deposition of the sand- 

 stones. North of Pokhra there is a long straight ridge of dark 

 coloured Bijawar quartzite. This ridge is interrupted by a cross 

 valley west of Jholukhor, but continues on the other side of the valley 

 as a spur of the Dadri plateau. The sandstone is not, however, 

 continuous across the top of this spur, which rises as a low ridge 

 from the sandstones on either side, and runs east by north to within 

 half a mile of Dadri. 



At the eastern end of this ridge there is a little faulting, the sur- 

 face of the sandstones to the north lying about 30 feet below that of 

 the same sandstones to the south, and this fault continues to be 

 marked by a slight scarp even beyond the termination of the trans- 

 ition outcrop. This fault is quite insufficient to account for the 

 exposure of the Bijawar quartzites, and their presence is only expli- 

 cable on the supposition that the older rocks had not only undergone 

 practically all their present disturbance when the sandstones were 

 deposited, but had also been exposed to extensive denudation of a 

 nature which left the hard bands standing out as elevated ridges. 



About three miles north-east of the Pabia hill another outcrop 

 of the red shale series begins. The bottom 



Red shale series. , . , , . i A i 



beds occupy a considerable area and on the 



( 128 •) 



