Hi 4Ws.... I'd guess the bowl is about 1ft diametre. I didn't manage to get a good pic of it as the rain was driving into us and we ran for shelter behind a wall... the Hag seemed to be venting her power at us being Samhien n' that!!

I'm about to upload some pics of 2 bowls at the Hangingstones site that seem too good to be the result of erosion. Pics will be up in a few mins.