. Calcutta journal of natural history, and miscellany of the arts and sciences in India. Natural history. Correspondence. 567 former would have dropped at Jamrud, the latter gone on to Peshawur, and this is precisely the ; The conclusions of Dr. Lord are exceedingly plausible, and that the tracts of country which he has marked out were originally the basins of lakes, is not at all improbable; such was originally the case with the valley in which the town of Bilappore on the Sutledge is built, and here you have evidence of the lake having occupied a level some three or four hundred fe
. Calcutta journal of natural history, and miscellany of the arts and sciences in India. Natural history. Correspondence. 567 former would have dropped at Jamrud, the latter gone on to Peshawur, and this is precisely the ; The conclusions of Dr. Lord are exceedingly plausible, and that the tracts of country which he has marked out were originally the basins of lakes, is not at all improbable; such was originally the case with the valley in which the town of Bilappore on the Sutledge is built, and here you have evidence of the lake having occupied a level some three or four hundred feet above the present bed of the Sutledge. The same we shall prove—and that too from incontrovertible facts, to be applicable to a series of other valleys on the banks of that river; we shall also prove that the great valley through which the Sicat river flows, whose waters are discharged into the bay at the city of Mundi, was also in the same position, but that the time when these lakes were emptied is geologically speaking comparatively recent, and connected probably with those convulsions and upheavings which raised the Sevalick or sub-Himalayan range to its present position. But we are quite at a loss to make out what he means by unquestionable geological facts, such as the structure of igneous rocks, poured out under strong pressure, &c. That igneous rocks are distinguished from volcanic rocks by their structure, by the method of their formation, as he has mentioned, and also in not presenting any crater of eruption, is generally known. But he does not inform us whether those so-called igneous rocks have been the means of causing those convulsions which converted these lakes into valleys ; if so, then they (igneous rocks) must belong to an epoch of comparatively recent date, because he mentions the presence of fossil shells belonging to the genera Planorbis and Paludince, both of which belong to the tertiary series, and many species of which are now in existence. If t
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