Freeport, Maine is home to the tract of glacial silt that is of what measure?
Freeport, Maine:  Known for its numerous outlet stores, Freeport is home to L.L. Bean, Wolfe's Neck Woods State Park, and the Desert of Maine. Desert of Maine: The Desert of Maine is a 40 acre tract of exposed glacial silt (a sand-like substance, but finer-grained than sand) surrounded by a pine forest near the town of Freeport, Maine, in the United States.
40 acre