ii4 



GEOLOGY OF THE SON VALLEY, ETC. 



neighbourhood. This breccia consists of a mass of angular frag- 

 ments of slate, often almost or quite free from finer-grained matrix, 

 and so closely packed that, where the surface is covered with 

 vegetation, the imperfect exposures might easily be taken for trans- 

 ition slates. Through this breccia, which is principally composed of 

 small fragments of a few inches across, are scattered blocks of white 

 vein quartz, running to a foot in diameter and only rounded to a small 

 extent on the angles. 



Ascending the section which is shown in Fig. 7 the breccia 

 becomes more and more mixed with sand and finally passes into the 

 hard, white, quartzitic sandstones of the Barhata plateau, by which 

 it is overlaid. The thickness of the beds between the coarse con- 

 glomerate and the white sandstone is about 700 feet on this section, 

 N w 



SE 



Fig. 7. Section north-west of Barhata. T, transition ; /?, red shale series ; Vh, basal 



stage ; Vp y porcellanite stage of lower Vindhyans ; Vu, upper Vindhyans. 



Scale 2 in. = i mile. 



Traced in either direction the coarse-grained beds rapidly thin 

 out, and more rapidly to the south-west than to the north-east. The 

 coarse conglomerate does not extend for more than quarter of a 

 mile, the breccia thins out and disappears at about three-quarters of 

 a mile to the north-east and half a mile to the south-west of the 

 section in the valley, and beyond this the white sandstones are in 

 direct contact with the older rocks. A section drawn along the 

 strike, and at right angles to that shown in Fig. 7, would consequently 

 be something like Fig. 8 . 





Fig. 8. Section at right angles to Fig. 7. Scale and lettering as before, 



( "4 ) 



