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FourWinds F
FourWinds Sep 19, 2003 10:37:21
Replying to nigelswift

"Is there a tendency for bullauns to occur more in soluble rocks like limestone? Or radon rich granite?!"

Bloody good question! I've seen sandstone and grantite ones. Proportions? Dunno. Churchy ones have a habit of being sandstone (I think). These are more usually in boulders and single.

Most multiple ones I've been to are in bed rock and are granite.

N nigelswift
nigelswift Sep 19, 2003 10:55:38
Replying to FourWinds

Making a bullaun out of a highly porous rock, like coarse red sandstone, would be a bit of a waste of an afternoon. But then, maybe we spend too much time praising their cleverness, they must have also had a fair proportion on Neolithic prats!