There is apparently a carving at the entrance of the fogou – you can see it on the CAER site here:
caer.co.uk/index_files/CAER/carving.htm
It was noticed by Dr EB Ford, who excavated the site in 1957. The Caer logo is based on the carving – interpreted as a person holding a staff and a snake. It looks rather ambiguous in the photo though – but perhaps you’ve seen it yourself?
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