Chester sits on an outcrop of rock, in the middle of what was once a sea, hence the proliferation of salt mines in Cheshire. The local stone is red sandstone, and when the Romans arrived they opened up a quarry in Edgars' field, and Chester was largely built from it. Red sandstone is very easy to cut, but unfortunately this means that it is also very friable and wears away relatively quickly. In the photo below you can see part of the repairs to Morgan's Mount, which was constructed in 1645 - the lower blocks of stone have had to be replaced, those above are original.
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