I see them but only have more questions.
If you have a pond which is watering stock, every so often you'll clean the sludge out (and it's a rich fertiliser). The only sure way to 'date' a pond is to look at the layers of deposited gunge - like tree rings - and to count backwards. Siltochronology.
If a pond were lined with stones that would be an excellent protection against those stones being reused elsewhere - in a later wall, for instance. The Stonehenge roundabout has lasted so long and there's no intrinsic reason why a pond shouldn't have lasted that long also. Maps give some small clues - if a pond is between two fields then it is probably older than that field division, for instance. The round shape is also a bit of a giveaway.
A pond at the foot of a sacred hill is probably - - - very old (and I'd better go and photograph it).
david
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