438 Journal of the Asiatic Society of Bengal. [NS., XIV, 
main outline of a spread of Charnockite, the fringe of which 
penetrates into Mysore territory, has been surveyed by Middle- 
Archean. I had never, until then, had occasion of actually 
observing the Charnockite Series in the field, and I take this 
opportunity to thank Mr. Bosworth Smith for the gracious 
manner in which he explained to me the characters of various 
outcrops of these rocks. The region in question is the neigh- 
bourhood of Palni and Dindigul north of the Palni Hills. The 
area situated north of the Palni range is largely in the condition 
of a high-level plain occupied mostly by the Archean biotite- 
gneisses. The plain is traversed at intervals by narrow elon- 
gate ridges stretching for distances often of many niles, con- 
sisting principally of Charnockite. The rocks are undoubtedly 
d 
intermediate in age between the Dharwar and Cambrian. 
These Kadapah-Bijawar rocks are often quite unmetamorphosel 
and there is not the slightest doubt that the banded casa 
. 
in soluti 
spfings in volcanic regions at the present day. The roc 
