The results of a gravity survey have been interpreted with seismic reflection and borehole data to show that a major change in the structure of the upper crust underlies the Hog’s Back W of Guildford, Surrey. The pre-Mesozoic basement beneath the thin Mesozoic succession N of the Hog’s Back is of a lower density than that underlying the thick Mesozoic succession to the S. This lower density basement was probably the principal cause of the relative stability of the London Platform during the Mesozoic era. The sourthern boundary of the London Platform may have been initiated by Variscan thrusting with subsequent reversal of displacement, or may be inherited from an older crustal lineament.

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