"The idea that nitrates in the soil might indicate that some structures were used as corrals is an interesting one; the only problem there is that such structures may have been used as corrals at any time during the last x thousand years; Avebury is a classical example of that where sheep have been grazing within the circle for as long as I can remember"
That is a very good point and invalidates my point about high nitrate levels being indicative of henge corrals.
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