j20 NERBUDDA DISTRICT. 



towards Bhopal, Sagur and Dumoh, in whicli direction they gradually 

 die out (see Plate II;) on the south and south-west the Trap is found to 

 cover considerable areas among the Gondwarra hills and it becomes 

 gradually more and more the prevailing surface rock in this direction, 

 and, so far as known, connects itself with the great Trap area of the Dec- 

 can. 



Besides the rocks already mentioned several other vareties exist. 



. Granitic and gneissose rocks and crystalline schists 



Other rocks expos- fo 



ed - are exposed in many places in the banks of the 



Nerbudda, in those of its numerous tributaries, and in many other parts 



of the valley, sometimes covering considerable areas, and often forming 



prominent features in the scenery of some of the most picturesque parts 



of the country. 



The classification made use of in the following pages will be that 



proposed for the rocks of Central India by Pro- 

 Classification. .■','«-/./ l -, , -\ nil 



fessor Oldham in 18oo (see above page 11 0). I he 

 differences between the following list, and the series as then given by Mr. 

 Oldham will be found to consist of one or two additions. These are sub- 

 divisions introduced among the groups then indicated, but not changes 

 in their arrangement ; they are developements of the original sketch, not 

 alterations of it. 



In our descriptive remarks, we shall commence with the granite and 

 reserve the trappean rocks for the last, and with the sedimentary 

 deposits we shall proceed in ascending order. 



§ 2. Granitic Rocks. 



Eocks of granitic type, although often seen at the surface, do not 



. , , occupy large areas in this portion of Central India : 



Area occupied by gra- * * l 



nite- the largest of these areas is found near Jubbul- 



pur where the granite forms a range of low hills running from Lamcta 

 Ghat on the Nerbudda in a north east direction. 



