The geology of London comprises various differing layers of sedimentary rock upon which London, England is built. == Oldest rocks == The oldest rocks proved through boreholes to exist below London are the old, hard rocks of the Palaeozoic.
The geology of London comprises various differing layers of sedimentary rock upon which London, England is built. == Oldest rocks == The oldest rocks proved through boreholes to exist below London are the old, hard rocks of the Palaeozoic.
Source: Wikipedia "Geology of London" · CC BY-SA 4.0
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