Figure 7.
The image illustrates a cross section of Tower Bridge, showing the bridge structure alongside geological layers including river water and formations such as London Clay, Lambeth Group, Thanet Sand Formation, and Chalk Group. Measurement annotations detail heights in metres above the tunnel datum, A T D, with indicators for mean high water, pier foundation level, groundwater line, and tunnel axis level. The diagram shows the vertical positioning of the bridge in relation to its geological context, with labels and a colour coded key for clarity. An overlay includes measurement lines and a circular outline denoting a diameter.Tower Bridge and relative location of main tunnel