Norman Muller sent this link http://thesga.org/tag/rock-piles/
[There is plenty of digging and dating, but do not hold you breath: no solid conclusions]
As I read the linked to pdf (you can click on it from within the above link) where the author reviews a large number of wonderful sites and concludes they are not from field clearing but rather from temporary staging for later sale of rocks, I am disappointed. It is largely an exercise in assumptions.
Perhaps I am wrong but I get a strong sense that raw observation is secondary to applying truisms. For example "historic rock piles are not interesting".
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