In Ipswich, Massachusetts lays the Ipswich River. 15,000 years ago the Laurentides ice sheet melted and deposited its sediments known as moraines parallel to each other creating the banks of the Ipswich River. These banks are named Jeffreys Neck and Castle hill. Over time the sand and rock that the alpine glacier collected was deposited into the Atlantic. Longshore drift carried this sediment back onto the beaches. As strong winds came in, they blew the finest particles of sand into the grasses above the beach. After many years this has created 1,200 acres of white sand dunes at Castle Neck. So if you were to go here today you would see a large sand dune covered in marsh grass, cranberry bushes and large oak trees. Although still lush with such vegetation, it is very empty compared to what it looked like during the 1600's. During this time oaks populated much of this land but had been almost entirely wiped out when new settlers arrived.

http://www.wickedlocal.com/wenham/news/lifestyle/columnists/x1790524963/A-walk-in-the-Ipswich-dunes

http://www.trekearth.com/gallery/photo677200.htm