I visited the Hampshire formation today.  It was pretty amazing from the ground.  Looked fairly new with few visitors.  Andy Fowlds was there with us and none of us found any signs of being man-made.  I included the exact location in my e-report as well as a bit more information about the design.  I made a sketch while in it today and have attached it as well as a couple of close up photos.  It is nine-fold geometry with an 80 foot wide central circle and a large thin outer ring enclosing the whole design. 

Ross Holcomb