DECCAN TRAP. 
100 
doleritic composition, but this is not a sorions objoction, and it 
may be that the glassy matrix if crystallised would have yielded 
augite. For the present, therefore, I am inclined to ado|)t the 
hypothesis that the Chirmiri volcanic rocks are of intrusive rather 
than of extrusive origin and possibly of JJeccan Trap age, although 
there is no direct evidence of this. The facts against this hypo- 
thesis, namely the vesicular nature of the rock and its failure 
to extend in depth where the stream cuts across its outcrop, are 
not insurmountable difficulties, and may be explained at some 
future period when it is possible to make a careful investigation 
of this problem. 
