Maybe I should have put ;-) instead of :-) I wasn’t making a serious suggestion about discovering some new feature (sorry Squido!) The few square miles around Stonehenge must be one of the must studied landscapes in the country and I’m sure whatever the feature is (geological rather than archaeological), it is well known and documented. My guess is still the crop mark of an ancient river channel but that’s as far as my ‘O’ Level geography goes.
Chris :-)