The geology of the London area has been of interest and concern to its occupants ever since the Romans found that the readily available building materials – wood, reed and mud – were not good enough to defend them against disaffected pyromaniacal locals. Defensive strategies and changing technological demands have continued to drive the geological investigation of the city and its ‘urbs’ ever since. The most recent extension to the Jubilee Line underground and the Channel Tunnel Rail Link have required the driving of new investigative boreholes from which a great deal of new information about the subsurface geology has...

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