Lots of single cup marks have been recorded in England by experienced competent researchers . Recognition is mainly due to experience i.e. recognising genuine examples and being aware of the natural markings associated with the particular geology the markings are on . Grit , like most the surfaces most often chosen for engraving certainly has plenty of the latter . In the case of single cup marks it is not always possible to be absolutely sure , particularly if there are no other markings in the area , and they most probably would be considered “possible “ .
Judging a single cup mark from an image is not ideal but it wouldn’t do any harm to post some pics .
You do find cups/markings on limestone but they are uncommon .
The vast majority of marked rocks are not found at the top of hills , if anything , it would be the least likely point to find them , although they might be found on the slightly higher point in the local topography i.e. top of a knowe / knoll etc .
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