Last week I went on an interesting walk round Overleigh Cemetery, looking at gravestones through the lens of geology. It was interesting to note that the later the date of the grave the further away the headstone comes from. Earliest examples of Chester headstones (i.e. Roman) are made from the local red sandstone, which does not weather well (those in the Grosvenor Museum are in such good condition because they were buried within the walls). Below are two much later (1950s) both made from lighter coloured sandstone, one of which has weathered very badly, because the sediment was less well cemented.
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