230 NERBUDDA DISTRICT. 



in which it stands, has a jagged, broken outline which contrasts strangely 



■ ._ with the tabular arrangement and vertical sides 



Jamghur and Bower- c 



ghur. f the latter. Even at this distance, it will be 



evident to him that Bowerghur is formed of the crystalline rocks, 

 and Jamghur of the massive sandstones of the Mahadeva group. 



Round from this to the south, pointed peaks and saddlebacked ridges, 

 mark the continuation in that direction of the same class of rocks, nor 

 can the observer doubt but that the flags and shales which are seen in 

 the glens by which he approached Asseer fort, underlie the hill on which 

 it is built, spread over the wide valley on the west, and underlie all the 

 other tabular masses of sandstone around him. But again, consulting 

 the map and observing the coincidence visible on it of the geological 



boundaries, with the physical features, the great 



Vindhyan Boundary. _,. ,, , • . • i .-, , , ., 



Vindhyan escarpment is certainly the most strik- 

 ing example. The manner in which the boundary of the crystalline 

 rocks runs along the base of the range south of the valley, from Lokur- 

 tullye' (east) to near Jubbulpur, is only less remarkable. The generally 

 rectilinear character of some of the geological boundaries will also be 



, . remarked : both of the above mentioned boundaries 

 Geological boundaries 



straight lines, ff Qr examples of this, as does that between the 



crystalline rocks and the upper Damuda rocks to the north east of Jub- 

 bulpur. Again, the southern boundary of the Talcheer and lower Damuda 

 rocks of the hill country, North of Betul and Chindwarra, is a case 

 in point. 



Considerations connected with these facts will suggest to the geologist 



even from an inspection of the map, the probability 

 Conclusion suggested. " 



oi these rectilinear boundary lines being also lines 



of fault, and this, as has been already more than once insisted on, is in 

 reality found to be the case. 



If we commence our examination of the north boundary of the Ma- 

 hadeva rock in the western extremity of our larger map, PI. I, near 



