116 NERBUDDA DISTRICT. 



3rd. — The passage upward of these Sandstones into the rocks contain- 

 ing remains of large Yertebrata was pointed out. 



To this classification, more recent and detailed examination has 

 enabled us to add the sub-division of the Damuda into two groups 

 upper and lower, and has thrown much light on the relations of the 

 trap flows and the associated beds. 



Of the evidence on which those conclusions rest, we shall now proceed 

 to speak. 



CHAP. II — GEOLOGICAL STRUCTURE OF THE DISTRICT. 



§ 1. Physical Geography. 



In addition to that part of the valley of the Nerbudda which lies 



between Hindia on the west and Jubbulpur on 

 Area mapped. t . ', . 



the east, the map which accompanies this report, 



also includes the Gondwarra range on the south of the river valley, 

 as well as a small area stretching to the north-east from Jubbul- 

 pur to the Johilla River, one of the principal affluents of the Sone. 



The Nerbudda taken altogether, from the source of the river to the 

 sea, constitutes one of the most important and 



Connection of the 



Physical with the Geo- interesting features of the Physical Geography of 

 logical structure. ... 



Western India, and in no part of the valley is its 



peculiar and characteristic configuration more strikingly exhibited than 

 in that portion included in the accompanying map. 



It will be shown hereafter, that this peculiar configuration of the 

 present surface of the ground is the direct result of Geological struc- 

 ture, and it has consequently been thought desirable to reserve a detailed 

 description of the physical aspect of the country and of the relations 

 which this aspect has to Geologiral causes until after the various rocks 



