The following is a map unit description from the "Soil Survey of Barnstable County, Massachusetts (Fletcher, 1993)"

Dn-Dune land.

This map unit consists of nearly level to very steep areas of shifting, windblown sand (fig. 9). These areas are devoid of vegetation. They make up approximately 0.4 percent of the survey area. The unit is mapped in one area 935 acres in size. This area is between Provincetown and Truro.

Generally, these areas are light brownish gray, loose sand to a depth of 60 inches or more.

Included in this unit in mapping are vegetated areas of Hooksan soils. Also included, in depressions, are areas where the seasonal high water table is near the surface. Included areas make up about 10 percent of this unit.

Permeability is very rapid throughout the Dune land. Available water capacity is very low. Depth to the seasonal high water table is more than 6 feet.

Because of droughtiness, low fertility, and the slope, this unit is unsuited to cultivated crops, hay, pasture, and trees. It is unsuited to most nonfarm uses because of the unstable nature of the shifting sand, the very rapid permeability, and the slope.