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The sub‐drift surface of the Mersey and Weaver catchment and adjacent areas
Author(s) -
Howell F. T.
Publication year - 1973
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350080207
Subject(s) - meltwater , geology , glacial period , pleistocene , drainage basin , borehole , geomorphology , oceanography , sea level , physical geography , hydrology (agriculture) , paleontology , geography , cartography , geotechnical engineering
Evidence from 1,450 boreholes and coastal seismic profiles adds further precision to the form of the sub‐drift channels of South Lancashire and North Cheshire. These channels resemble sub‐aerial valleys, but commonly have ungraded profiles locally reaching at least 289 ft (87 m) below O.D. In some places they are still below present sea level, 40 miles (64 km) inland. It is suggested that previous views of origin can be reconciled by considering them to be river valley Systems, partly rejuvenated by low Pleistocene sea levels, and locally modified by sub‐glacial meltwater.