I reckon the "bowls" are natural enough. I can't remember where I saw it - actually I think it was St Nectan's Kieve, where it happened on a MUCH bigger scale! - where you'd get a stone rattling around in the eroded rock, and the more it's rattled around, the more it helps the erosion. It'd go spinning around in the dip for years and years until it's created quite a hole.
Although it could also be to do with the nature of the rock itself for all I know! :D Seems there's quite a few rocks around with this feature, so maybe it's just the way it erodes.
Andwhile I think of it...
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G x
Cheers Goff, much appreciated. Not sure about the naturalness of it myself due to the overspill groove and the exit groove, but of course they could have been put in much later!
