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ClydachGeorge wrote:
Could well be - it would certainly fit in terms of size.
Sandstone/limestone? Don't know the area. Would seem the most likely explanation. Either a millstone or something mysterious. Whatever gives you the greater pleasure. ;-)

Coarse sandstone (gritstone) predominates at the surface - with carboniferous limestone in abundance too.

I have a good picture or two which would help a great deal. I could add them to the Mynydd Llangatwg page - but it won't move past the 'Submission Guidelines' despite me accepting the terms and conditions)