"so extensions at both ends ?"
that's just what I'm suggesting, that's why I called them proto-henges being precursors from the central european neolithic (5000 even 6000 BC)
There's also rondels in Hungary of course, because modern borders do not make sense in prehistory,
http://korarok.baranya.hu/index.php?lng=e
And even more intriguing is current intense discussion on whether the famous calcolithic round enclosures in Portugal have anything to do with them, but I think that connection's more far-fetched and coincidental though
http://portugueseenclosures.blogspot.com.es/2012/03/0085-why-are-they-round.html
I knew there were one or two henges in Wales (hence the ??) but, again, far too few to be of much significance in a global context
Fascinating!!
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