On a Sea-coast Section of Boulder-clay in Cheshire

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Abstract
The threefold division of the great north-western drift, established by Professor Hull, extends into the peninsula of Wirral, if not further south, in Cheshire; and I have found it strongly marked near Padeswood station, Flintshire. To the south of the Mersey, the Lower Boulder-clay becomes very attenuated or patchy, while the upper or brick-clay becomes thicker or more generally diffused. In many places the upper clay is underlain by extensive and persistent deposits of non-glacial sand and gravel (attaining at Gresford a thickness of 150 feet), which rest on rock, excepting where they are underlain by a few remnants of the lower clay which escaped denudation. In other places the upper and lower clays coalesce. One of the best instances of the two clays in contact, with their distinctive characteristics still preserved, may be seen at Dawpool, on the N.E. side of the estuary of the Dee. From Parkgate the lower clay (with large boulders), under a thin covering of the upper clay, may be traced nearly all the way to the Dawpool cliff-section, which reaches about 50 feet in height, and extends for a distance of three miles. In the part of this section S.E. of Dawpool cottage, where it has not been obscured by talus or the effects of rain, the upper may be seen to be separated from the lower clay by a line (either winding or straight), which in some places is so sharply defined as to indicate that the top of the lower clay had

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