From ‘WRAO’ on Facebook:
“Six? possible cup-marks on a stone re-used as a gate post. The hole in the centre is for a gate bolt and is distinctly different in character to the standard bowl profile of the cup-marks. This stone is of an unusual geology but does contain fossils which could cast some doubt over its validity as a Neolithic / EBA stone. However there are a number of factors which work in favour of this hypothesis, which we will go into in more detail as we add it to the database.”
facebook.com/photo.php?fbid=10150659020813087&set=a.316542978086.148860.139105033086&type=1
There is a picture on the site.