Abstract
Before treating of the stratigraphical distribution of the Low-level Boulder-clay and sands of Lancashire and Cheshire in which the shell-fragments occur, I have thought it better to discuss first, by the light of the fragments themselves, the geographical distribution of the species represented, their mode of occurrence and condition, and the nature of the matrix in which they are found—some of the problems involved in an accurate interpretation of the glacial-marine phenomena of the drift of the north-west of England.

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