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a pile of stones that is used as a boundary marker, a memorial, or a burial site. Cairns are usually conical in shape and were often erected on high ground. Burial cairns date primarily from the Neolithic Period and the Early Bronze Age. Cairns are still used in some parts of the world as burial places, particularly where the soil is difficult to excavate or where wild animals might disturb the body. The term cairn is sometimes used interchangeably with barrow, and its usage is not well defined. See also barrow; burial mound.