Stone walls are a trademark of New England, originally used as the boundaries in fields built by the first settlers in the area. A product of post-glacial New England, farmers would have to remove many stones from their fields each spring. During the winter as the earth froze and thawed, rocks rose to the surface of the fields; they had to be removed before plowing could proceed. Stacked at the edges of the fields, they were the raw material for all those stone walls. Today, stone walls still remain popular in New England landscaping and construction.