Perhaps these piers were where Stonehenge stones arrived in England. What a scoop :-)
That's fascinating Ike. The posts you show at http://farm1.static.flickr.com/144/329334615_c5441e7afe.jpg?v=0 are obviously manmade and shouldn't be hard to date. How far away is the stone you show at http://farm1.static.flickr.com/128/329334717_acf7d48063_m.jpg from the 'pier'? Are the dimensions of that stone similar to anything at Stonehenge?