Recently I received a couple of photographs from Pat Morrissey of some stones on the Eastern shore of Glensherup Reservoir near Glendevon (Perth and Kinross). He would be very happy to have your opinion about the status (man-made or natural) of the cup-like depressions.
For the location of the finding spot click here.
I think the cups on photo A, except for the “hole” on the front-side, come close to the genuine ones. The features in photo B, C and D are likely to be candidates for the description “natural”.
I know that it is hard to make a proper judgement from photographs, but I hope you would give it a try!
Have a nice weekend.