CHAP. 3.] CONCLUSION. 291 
Taking then into consideration such poor evidences as the re- 
semblances just described allow of, the following 
Conclusions. n A 
suggestions as to the correlation of the Madras 
rocks with those of Northern and Central India are put forward :— 
The KARNULS appear to be Upper VINDHYANS. 
There is such a thorough unconformity between the former and the 
KADAPAH formation, a form of stratigraphic break, which does not, as far 
as is known, exist between the upper and lower divisions of the VINDHYANS, 
that we are necessitated to look for representatives of the KADAPAHS 
among the Gwaliors or other like formations which may be overlaid as 
unconformably by the vINDHYANS. 
On this view, the Chey-air beds of the KADAPAHS appear to answer 
best to the Gwaliors. 
At best, however, comparisons which are mainly dependent on 
lithological resemblances are as yet comparatively useless in the con- 
sideration of these Indian rocks. Even now, our colleagues in the 
Bengal Presidency are finding fresh fields and series which are litho- 
logically like the Kapapaus; while there is still great room for 
admitting further groups into comparison with these, for as yet the 
Chey-air beds, which are supposably like the Gwaliors, are only one group 
out of the four of this formation which are all separated by uncon- 
formity and overlap. 
The further investigation of the relations of these Madras rocks to 
those of other provinces must then be left until the intermediate country 
between them is gradually worked out, when it may happen that the rocks 
of the north shall be almost brought into close proximity with those of 
the south, and closer and more satisfactory correlations made than those 
meagre ones which are attempted now. 
