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It is made from Kentish Ragstone, a hard grey limestone quarried from Kent that was also used in the construction of the Tower of London and Westminster Abbey.

A mix of old lime-washed, coralline ragstone and more modern, concrete buildings, Stone Town's skyline now has a more certain future.

Ragstone, assheler ffreston with cariage, masons and labourers for the vantyng and ffurryng of the pilers and purvyaunes vnto the xxvij of maii mlmlvcxlix li. xj s. j d. ob.

Above this are 147 ft. of freestone, 7 ft. of oolite marl, 34 ft. of upper freestone and 38 ft. of ragstone.

Filberts and cob-nuts are a special product of Kent, in the neighbourhood of Maidstone principally, and upon the Ragstone soils, certain conditions of soil and situation being essential for their profitable production.