What are the cape cod dunes?

The Cape Cod National Seashore is home to some of the tallest and most parabolic sand dunes in the Western Hemisphere. These shifting dunes are ever-changing, creating a dynamic landscape that is both beautiful and fragile. Cape Cod has one of the few remaining regions of coastal dunes in the north-eastern United States, with 40 miles (64 km) of uninterrupted dunes.

Most Cape dunes formed when the retreating glaciers melted and produced an enormous quantity of meltwater that eventually became streams. The streams flowed at varying speeds and formed gravel deltas where they entered coastal waters. These deltas were shaped primarily by wave activity, resulting in the formation of barrier beaches and lagoons like Nauset Marsh and Pleasant Bay.

In places where the longshore drift carried sand along the shores of deltas and beaches but there was not sufficient space for the sand to be moved further along, the sand piled up and formed dunes. For instance, the great hooked arm at Nauset Beach is held together by dune growth around a glacial drumlin.

Sand dunes are created when wind picks up sand from the beach and carries it inland. As the wind slows down, the sand is deposited in dunes. Over time, the dunes can grow in size and become stabilized by vegetation. The dunes on Cape Cod are important because they help to protect the shoreline from erosion and storms. They also provide a habitat for a variety of plants and animals.

The Cape Cod National Seashore provides a unique opportunity to study the formation and evolution of sand dunes. The park is home to a variety of dune types, including parabolic dunes, transverse dunes, and blowouts. Parabolic dunes are the most common type of dune on Cape Cod. They are typically crescent-shaped and have steep, curving faces on one side and gentler slopes on the other. Transverse dunes are long, narrow dunes that run parallel to the shore. Blowouts are large, open areas where the wind has removed all of the sand.

The dunes on Cape Cod are a dynamic landscape. They are constantly changing shape and size due to the forces of wind, water, and vegetation. The park's extensive trail system allows visitors to explore the dunes up close and see the changes that are taking place.