II.—On the Structure of the Thames Valley and of its Contained Deposits

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Abstract
While we have in the deposits described no signs of any line of drainage conterminous with the valley through which the Thames now finds its way from London to the sea, until after a series of diverse conditions, and until a most recent date,—that of the Marsh clay, we shall find, in the physical structure of the valley, evidence corroborative of that afforded by the deposits; and showing that the present valley of the Thames is a creation subsequent to all the deposits which it contains that are older than the Marsh clay.

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