SEC. 7.] THE CHAKWAR AND KATROL RANGE. 195 



base of Nunnao. The same complicated alternation of intrusive and inter- 

 calated appearances prevails among these traps^ the most interstratified 

 looking portions of which are seldom far removed from cases 

 of distinct intrusion ; so that lacking clearer evidence of their being 

 contemporaneous, while everything along this portion of the great 

 fault indicates intense disturbance and dislocation of the beds, it is safer 

 to suppose that the igneous materials have found their way between the 

 disturbed strata where alternation is now apparent. 



The Upper Jura beds south of Drabwa Hill undulate nearly hori- 

 zontally, and a mass of white, silicious rock forms 



Beds of the Kutch 



Upper Jura group, south a knoU just at the foot of the hill in which no 



of Drabwa Hill. 



decided dip could be traced. Westwards towards 

 Nunnao these upper beds become contorted with high northerly dips 

 and some sharp anticlinal curves. Through this disturbed country 

 the great Charwar and Katrol fault seems to strike directly for Nunnao 

 Hill. 



This hill of Nunnao is a nearly circular, lofty, dome-shaped mass of 



trap, having an elevation of 770 feet and a basal 

 Nunnao HiU. 



circumference of more than S^ miles. It was 



probably the source of some of the neighbouring stratified traps, but, 



its height exceeding greatly that of their lower ilows, some of which 



approach it nearly, eruptions issuing here would be more likely to have 



formed portions of their higher and newer beds. However this may be, 



no direct connection at present exists between such, flows and this hill as 



a soures, nor has it at aU the appearance of being an extinct sub-aerial 



volcano. If it were ever surrounded by an envelopment of scoriae, dust 



and lava, these have all been swept away by denudation, and little 



besides the core remains. This is not homogeneous, some external 



portions being of soft, easily-decomposing, ashy traps, and others of 



intensely hard intrusive basalt projecting in the form of crags, columnar 



( 195 ) 



