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Till sheets that are separated by a palaeosol upon the lower one, however, must be interpreted as deposits of separate ice advances, separated by a length of time sufficient for soil formation. Variations in structure within each till sheet can be explained by the 'Boulton hypothesis'.
The recognition of structural and compositional differences within till and other glacial deposits, as illustrated, is of importance to engineers designing excavations, tunnels, foundations, water supply and waste disposal projects. If the lateral and vertical variation in density, permeability and other engineering parameters is not recognized, unexpected problems may arise. Professor White hoped that Dr Boulton would find it possible to deal with such geotechnical application of his findings in some future paper.
The AUTHOR thanked Professor White for his remarks and was encouraged to hear that interpretations such as he had just outlined could be applied to many North American sequences.
On the question of palaeosols, he agreed with Professor White, but
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This 250-word extract was created in the absence of an abstract.
