BETWEEN THE SON AND THE BANAS. Ill 



lower Vindhyans form a very conspicuous ridge running away to 

 north-eastwards. This ridge terminates on the bank of the Son near 

 Bukailli in a sharply folded anticlinal whose axis dips to the south- 

 west; the sandstones are again bent up by a synclinal and the ridge 

 continues, with a steady decreasing importance consequent on a 

 decreasing thickness of the hard beds, till it is crossed by the stream 

 which flows past Marai. Beyond this the sandstone can be traced 

 with difficulty through low jungle-covered hills where it forms no 

 defined surface feature, and is altered almost beyond recognition by 

 weathering. It appears to bend round, much as shown in the map, 

 and end up against the great fault which had been traced from the 

 Son. 



Above basement sandstones come fine-grained greenish shales 

 overlaid by a thick band of limestone, at the base of the porcellanite 

 stage. These horizons can be traced with ease on the Son river 

 near Narwar, and in the bed of the Son at that village the limestone 

 and porcellanites are seen bending round from a north-westerly to a 

 southerly dip, the outcrops of the hard bands forming a series of 

 curved barriers across the river bed. To the south of this Son no 

 exposure of the porcellanite stage could be found, but in the bed of 

 the stream flowing west of Ghusra, the limestone is exposed. The 

 country here is deeply covered by river deposits and no exposures are 

 seen, but the most probable explanation is that the outcrop of these 

 hard beds is cut off by a fault. 



The fault which had been traced from the Son forms the northern 

 boundary of an outcrop of the red shale series 



Red shale series. , ., . .. 



whose western extremity runs under the scarps 

 of the Kharara outlier, from below which the beds issue with a 

 nearly vertical dip. The northern boundary of this outcrop is a 

 natural one, the basement beds being represented by a thin 

 sandstone. The northern boundary is formed by the fault referred 

 to for about five miles ; beyond this the northern boundary is a 

 natural one, the basement beds being seen, where not hidden by 

 surface -deposits, to the neighbourhood of the Samdin. 



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