Chalk hills extend across the county of Kent, from Dover to Gravesend, but most of the surface chalk is of a soft and porous quality, unsuitable for unprotected external work. The first example below shows how the medieval city walls, constructed in the 1380s, relied on a hard flint surface (much of which is now lost) to protect the internal blocks of chalk. The second provides a rare example of internal medieval walls showing a jumbled mix of chalk, flint and other stones.
Local examples (click to enlarge and read captions)
Internal ground floor door, Zizzi Restaurant main street (St Peter's Street)
City wall, Pound Lane