Transgressive dunes

I mentioned at the end of last week's lecture the formation of transgressive dunes, which are large unvegetated coastal dunes that migrate landward. They widely occur in Australia, and were also common along the French Atlantic coast, until Napoleon planted pine trees to fix them (this area is known as 'Les Landes'). Some of these French Atlantic coast transgressive dunes, however, remained and the best example is Pyla dune just south of the Arcachon Inlet near Bordeaux. For more information see: http://unbelievableinfo.blogspot.co.uk/2012/07/great-dune-of-pyla-sahara-of-france.html.