lower transition rocks. 155 



5. Eruptive Rocks in the Dharwar Areas. 

 Though very numerous and conspicuous from their position and 

 colour, the intrusive rocks met with in the several Dharwar areas yet 

 occupy no very great area, and are of no great economic value. 

 They may be referred to the following four groups : — 



(a) Contemporaneous granites. 



(b) Pegmatite veins . 



(c) Brecciated Quartz-runs (" fault rocks "). 



(d) Trap dykes. 



Of these the last is by far the most important in every respect. 



(a) The contemporaneous granites. 

 The contemporaneous granites are rather similar petrologically 

 to the pegmatites to be described further on, but they do not cut across 

 the bedding of the schist as do the latter, but appear to lie quite con- 

 formably between the associated schist-beds. They are best seen 



in the bed of a small nullah (about a mile S. W. 

 The Itugi Section. 



of the mouth of the Nari Halla) where crossed 



by the road from Kampli to Itugi (Ittagay). The granite-flows lie 



between beds of grey gritty schist which have a gentle roll to the 



eastward. 



Another section in which several such contemporaneous granites 



are to be seen occurs in this neighbourhood. 

 The Kampli Section. . .,,/,. 



It is formed by the small nullah flowing west- 

 ward from a low ridge \ a mile N. E. of Kampli town. The granite- 

 flows and the schists they are intercalated with are seen to be prac- 

 tically parallel with and conformable to each other. 



(b) Pegmatite veins. 



Veins of a size large enough to be shown in the map are of very 



rare occurrence, but smaller ones are in parts very common, but have 



no influence on the character of the rocks they traverse. They have, 



however, been mistaken by some geologists for 



Not veins from a l ntrusive veins emanating from a great granite- 

 general granitic mass. ° t> t> 



uprising by which the schistose masses of the 



( «55 ) 



