 Urn burials, where bones are buried in a pottery container, either in a more elaborate tomb, or by themselves, are widespread, by no means restricted to the Urnfield culture which is named after them, or even to Eurasia.Menhirs, or "standing stones", seem often to mark graves or serve as memorials, while the later runestones and image stones often are cenotaphs, or memorials apart from the grave itself; these continue into the Christian period.The Senegambian stone circles are a later African form of tomb markers.