The sub-drift surface of the Mersey and
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F. T. Howell
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Article
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1973
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John Wiley and Sons
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English
⚖ 722 KB
## Abstract 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