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And the reverse must also apply.

But are you suggesting that Mayburgh Henge formerly contained a Four-Poster stone circle ? Have you seen this ( http://www.themodernantiquarian.com/site/5693 ) ?

"According to Camden there were once four stones at the corners of a rectangle 60ft n-s by 53ft in the middle of the earthwork with four others lining the corners of the entrance"
Burl

Thats a nice looking earthwork but what makes you think that the "large L-shaped enclosure" may be Neolithic?