Back to Stonehenge

Have been exchanging some more thoughts with Ned on the site called "Armchair Prehistory" -- see here:
http://armchairprehistory.com/2010/03/25/bluestones-and-bell-curves/comment-page-1/#comment-49

Pondering on the impact of chalk on glacial and periglacial processes -- and on the mystery of why the long barrows of Salisbury Plain are apparently free of large stones...... except for Boles Barrow.