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- sandstone boulders lying on or near the surface, found mainly in the downs and heaths of southern England. They are the remains of a much more continuous layer which has been eroded away. Difficult to trim to a workable shape, they were used manly in prehistoric times in the construction of longbarrows and stone circles - Stonehenge is the most notable example. They were used occassionally in building once the technology became available to cut them to size.