Overleigh Geology - Lichenometry

A lot of headstones in Overleigh cemetery are, like this one, home to lichens. Lichens grow very very slowly, many at only 1-2mm per year, and some may reach 150mm. There is a branch of science called Lichenometry, and you can read more about it here: http://en.wikipedia.org/wiki/Lichenometry

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