On the Elevation and Denudation of the District of the Lakes of Cumberland and Westmoreland

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Abstract
The general structure of the district of the lakes of Cumberland and Westmoreland is well known to geologists, more particularly by the labours of Professor Sedgwick. My own task, in the general examination which I have recently made of the district, has been one of inspection and not of discovery ; and the object of the present communication is not the description of phmnomena, but the theoretical discussion of the causes to which they are to be referred. I shall enter into descriptive details only so far as may be necessary for this purpose. In the first part of the memoir I shall consider the structure and elevation of the district, and in the second part the ph~enomena of its denudation. 1. Boundary of the District.--In descriptive geology we may apply the term district to a portion of country comprised within any arbitrary boundary to which our researches may have extended; but in considering the theory of its elevation, a district must include the whole of that space throughout which we recognize a character of continuity in the external configuration and the observed phmnomena. Thus in the case before us, we must not limit ourselves to the group of mountains immediately associated with the lakes, but must extend the district eastward to the great Penine fault, which will thus form its eastern boundary. On the north, from Kirkby Stephen by Hesket round to Egremont and thence to Morcambe Bay, its boundary will be sufficiently marked by that of the New Red

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