130 GEOLOGY OF THE SON VALLEY, ETC. 



The thickness of beds exposed below the long narrow outcrop of 

 beds of the porcellanic stage is much broader on the south than on 

 the north, a difference which is in part due to a higher dip, and, 

 "ear the Gopat, to the northern boundary being faulted. Further west 

 where the northern boundary is one of original contact, the exposures 

 on the southern half of the syncline are much more imperfect than 

 on the north, but it is difficult to resist the impression that a greater 

 thickness of beds are exposed. 



The basement beds of conglomerate and sandstone are for the 

 most part thin and do not form conspicuous topographical features, 

 but in the eastern part of the outlier there is a thick band of strong 

 quartzite near the upper part of the shales below the porcellanite 

 stage, which forms a conspicuous ridge. Among these shales are 

 some limestone bands, one of which is seen at the crossing of the 

 Mohan between Dol and Rehi. 



The porcellanites present no feature of note. They are the 

 highest beds exposed and form a band of very broken ground, the 

 low hills being traversed by numerous cross valleys, many still occu- 

 pied by streams, while others are now dry owing to the streams they 

 originally carried having been cut off by valleys cut back along the 

 strike of the soft shales on either side. 



Another small outlier of lower Vindhyans is found south of the 

 Mohan. It is separated on the north from the larger outlier by an 

 anticlinal along whose axis the red shales are exposed. Only the 

 coarse-grained basement beds are seen, which are more developed 

 than in the principal outlier. They form a synclinal whose eastern 

 end forms the hollow in which the plain of Khamaria lies, while to 

 the west the axis rises and the conglomerates are found along the 

 crest of a ridge which rises south of the east-and-west reach of the 

 Gopat. The southern boundary of this outlier is marked by a fault, 

 along which the transition beds are brought up into contact with the 

 lower Vindhyans, except for a small patch of red shales, too small to 

 mark on the map, which is found between the lower Vindhyan con- 

 glomerate and the transitions, to the south of Ragwar. 

 ( »3° ) 



