From S. C. A. Holmes:

A glance at the Geological Survey “Ten Miles to One Inch” map of Great Britain (Sheet 2) will show that the basic solid geology of the area is Ampthill Clay (different from Kimmeridge Clay in lithological and mechanical properties), but the special interest of the resistivity traverse results lies in their relationship to the very variable Pleistocene and Holocene deposits that overlie the Corallian and other Jurassic formations and that are not readily investigated by isolated boreholes. Details of the south-western part relating to the One Inch New Series Sheets 187 (Huntingdon) and 188 (Cambridge) an published in the respective memoirs: Huntingdon and Biggleswade (1965), Cambridge (1969). More particularly, however, the Quaternary deposits are shown on the Six-Inch Library Copies TL 37, TL 47 deposited for public reference at the Institute of Geo logical Sciences in Exhibition Road, South Kensington. Something of the complex history and distribution of the Holocene is outlined in the Royal Geographical Society's Research Series No. 5 memoir on the Fenland in Roman Times, published in 1970.

It is not surprising that the foundation conditions were found to be more complicated than indicated by the preliminary borehole information described by McDowell. There is: no sand and gravel layer as such, but discrete spreads of 1st Terrace River Gravel: variably covered or encompassed by Peat, Shell Marl and Alluvium of different strati-graphical position. The ancient course of the River Ouse crosses the Bedford Rivers and the Washes at about a mile from

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