COUNTRY BETWEEN BANAS, ETC. 121 



Chapter VII.— COUNTRY BETWEEN the BANAS and 

 LONG. 82 oo # E. 



(R. D. Oldham.) 

 In the main area of the lower Vindhyans the bottom beds cross 

 the Son just below the junction of the Banas 



Lower Vindhyan main area. 



with the Son and extend eastwards for about 

 20 miles forming a bold range of hills, to which the name Kheinjua 

 is attached on some of the old maps. The eastern termination 

 ot this range is cut off by an oblique fault running west by north; 

 the outcrop is thrown about three miles northwards by this and 

 another nearly parallel fault and then runs continuously to Long. 

 82 . Coincident with the faulting the thickness of the bottom 

 sandstones lessens and north of the plain of Sidi it no longer 

 forms a continuous ridge. 



The beds above the bottom quartzite attain their maximum 

 extent near Samaria and Karowndia, this being principally due to 

 repetition of outcrops by faulting and folding, but also to a 

 greater development of the beds themselves. 



West of Samaria there is a small outlier of tfce crystallines 

 surrounded, except for a short distance on the east where the 

 boundary is faulted, by the bottom conglomerate of the lower 

 Vindhyans, which is seen in some sections to be immediately 

 overlaid by limestone. The bottom beds all round this inlier 

 have much less thickness than in the main exposure to the south, and 

 at the eastern end are so much reduced that the outcrops can only 

 be traced with difficulty. Near Pori there is an exposure of a hard, 

 grey, crystalline and somewhat siliceous limestone, veined with 

 quartz, which weathers into a ferruginous quartz-breccia ; the 

 occurrence of some quartzites of an older look than those of the 

 lower Vindhyans at the eastern end of the inlier, and the fact that 

 the exposure of the limestone just referred to lies inside the 

 run of the boundary, suggests that it is transition, and that a 

 small area of rocks of this age is exposed at the eastern end of 

 the inlier. 



( 121 ) 



