Sec. 1.] DETAILED DESCRIPTIONS. 79 



be conspicuous if the boundary were a line of fault. 3. — The continuation 

 of the line of division north to the neighbourhood of Bhopal, where 

 the junction, as already mentioned, is quite irregular, the Vindhyans 

 rising- as isolated hills from the plain of the traps. It cannot be 

 supposed that each of these little hills is surrounded by a series 

 of faults, but if they are pre-existing elevations around which the 

 traps have accumulated, there seems no reason why the larger scarp 

 should not have been so also. The present elevation of all the Vindhyan 

 hills above those of the trap is of course due to their far greater power of 

 resisting atmospheric action, and their consequently slow disintegration. 

 The beds of the Vindhyans immediately south of Bhopal are 



composed of the fine purplish quartzite-sandstone, 

 Petrological character 

 of Vindhyans near Bho- SO common in this part of the country, rippled in 

 pal. 



places, occasionally false-bedded, and, near Shums- 



gurh, marked with distinct bands of colour. Occasional beds of conglo- 

 merate occur, containing pebbles of granitic or gneissic rocks and of 

 quartzite, the latter often purplish and precisely resembling the matrix 

 in which they are contained. Small pieces of shale and fragments of 

 red jasper also occur, but they are rare. 



The dips are always low. Some of the beds are very massive, and 

 form well marked ridges. One ridge in especial 

 occurs just west of the Bhopal and Hoshungabad 

 road, south of the village of Akulpoor and Dohattia. The rocks dip 

 about 5° to the north, and weather on the top of the ridge into 

 immense crags, which are conspicuous from a great distance. The 

 northern or longer slope of the hill, as is generally the case with the 

 Vindhyan sandstone ridges, corresponds with the bedding of the rocks. 

 This ridge, after running east and west for 5 or 6 miles, turns sharply 

 to the north-west close to the small village of Jowi'a, the twist corres- 

 ponding with a change in the strike of the rocks^ which thence dip 

 north-east. In the course of some miles, their dip gradually changes 



( 241 ) 



