球状アンフォラ文化
Artificial mounds and other, clearly visible, above-ground structures have been re-used since the New Stone Age (and even in later times, often by much later cultures) for burials of bodies, bones or cremated remains (in urns). These more recent burials, of whatever form, are referred to by archaeologists as secondary burials. They are found in grave mounds, usually in those areas of the site that could at the same time be extended. In larger dolmens, passage graves, stone cists, etc. the re-use of the interior space available was usually closer in time to the original burial (e.g. by the Globular Amphora culture), if necessary also accompanied by the removal or addition of secondary chambers (as in the Megalithic tombs of Hagestad). The mounds of the megalithic tombs, which were usually covered with earth, were re-used following a similar shape as the original grave mound.