1918. ] The Charnockites and the Dharwars. 445 
biotite, accessory zircon, apatite and magnetite. It will be 
noticed that this composition is exactly that of the average 
gneissose Fundamental Gneiss from which it does not seem 
therefore to be separable as a truly distinct formation. It 
represents perhaps a zone amidst the general spread of biotite- 
gneiss of the Peninsula which, subsequently to its primitive 
consolidation, has become fused and active. It is considered 
by Jaya Ram to be intrusive, at its southern extremity, into 
the Coimbatore Charnockites. 
If we accept the latter relationship, it is conceivable that, 
even where intrusion is not observed on the large scale, 
considerable impregnation of acidic material may have affect 
the Coimbatore Charnockites, and the same may, perhaps, 
prove true of other Charnockite areas. 
y confirmation were found to the above outlined 
suggestion that the metamorphism which has originated the 
Charnockites is partly or largely a result of acidic impregnation, 
the “intermediate ’” forms of Charnockite would have to be 
regarded as somewhat of the nature. of “hybrid’’ or rather 
‘syntectic ” rocks. 
On the supposition of the identity of the Dharwar and 
geen Coimbatore district.” (Gen. Rep. | eol. Surv. 
dia, 1901-1902, p. 22). The Shevaroy group of hills according 
King and Foote include alternations of Charnockites (the 
the major hill-ranges, more or less felspathic quartzites, often 
with very distinct false-bedding, hornblende-schists, numerout 
a 
Gas 8, also occasionally crystalline limestones (Mem. 
ges, a 
l. Surv. India, Vol IV) 
‘Sarees ’ : eee f Khondalites with 
arising the above, the pas ge tbe Peninsula 
