Weathering Cracks and Split-Line Patterns in Archaeological Bone

Abstract Post mortem cracks in bone produced by action of weather or other agencies which cause shrinkage have been shown to be oriented in the same direction as split-lines produced by decalcification and punctures with a needle. Archaeological bone also shows split-lines parallel to weathering cracks in cases where preservation of the collagenous matrix is good. Limb bones of birds tend to have better preservation than mammal bones in the Lasley"s Point site in Wisconsin. Considerable microscopic structure of bone is preserved where decalcification and split-line processing are possible.