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COAL.                                  59
The following is the classification of the subdivisions of the Gondwana system, which is at present recog­nized by the Geological Survey of India :—
Dr. Feistmantel, the paleontologist of the Geo­logical Survey of India, has, on the evidence afforded by the fossil plants, offered the following detailed correlation with European formations :—
How far such identifications between parts of the world so remote from one another are to be relied on is perhaps open to question. There is much, no doubt, to be said upon both sides. It will only be possible for me to allude very briefly to the principal points at issue; but, before doing so, I propose to describe the leading characteristics of the several groups which constitute the lower portion of the above classification.
The Upper Gondwanas being of little economic importance, though of great interest otherwise, may be passed over in this communication. The two are probably separated by a very distinct break in time, as the lower are often much disturbed while the upper maintain their original horizontal positions. Taking
* The Kota Maleri beds alluded to below in the account of the Wardha field may be interpolated here.