Abstract
This study investigates possible variation in post-mortem histories during the Neolithic period in southwestern Sweden based on microscopic studies of human bone. Numerous megalithic graves were built in this region and good preservation conditions have left a rich skeletal record. After more than a hundred years of research, it is still a controversy whether or not these skeletal assemblages were the result of primary burials, or ossuaries where skeletonized remains were deposited. In this study we apply histological analysis to obtain insights into post-mortem histories and taphonomic processes affecting the human remains, potentially including funerary rituals. This type of analysis records the condition and traces of degradation found in skeletal material at a microscopic level. Human skeletal material from four different megalithic tombs in the Falbygden area has been sampled and analysed by thin-section light microscopy, and by scanning electron microscopy. The results of the study provide evidence of variation and changes in burial conditions for skeletal remains from the different graves, also for remains from the same grave. Extent of bioerosion varied, from extensive to moderate/arrested, to none. Bone samples from the same graves also differed in the type of staining and mineral inclusions, showing that the non-bioeroded samples relatively early post-mortem must have experienced an anoxic environment, and later a change to an aerated environment. This could be taken as an indication of primary burial somewhere else, but more likely reflect a special micro-environment occurring temporarily in some graves and parts of graves after the tombs were filled with soil and sealed by roof slabs. The study illustrates the usefulness of bone histological analysis in the reconstruction of post-mortem histories, revealing variations not discernible at macro-level that may aid in the interpretations of funerary rituals. However, the results also highlight the issues of equifinality. Based on current data and knowledge, several scenarios are possible. Further histotaphonomic work is advisable, including archaeological remains from megalithic tombs, and bones from taphonomic experiments.
Highlights
Far from being dead and buried, many prehistoric deceased bodies are likely to have gone through a variety of different funerary rituals before becoming part of the archaeological record, most of which will remain unknown to us
The Middle Neolithic passage graves have been the subject of systematic studies since the 19th century [12, 21, 22], but less is known about the Late Neolithic gallery graves
As the most common faith of archaeological bone is extensive bioerosion, and since a previous histological analysis had shown medium to extensive bioerosion in all samples from Gokhem 94 (GH94):1, it was surprising to observe that the majority of analysed samples from grave Torbjorntorp 18 (TB18), and one from Falkoping Ostra 1 (FO 1), were not bioeroded, A previous study recording bioerosion of bones in the Rossberga tomb [36] showed bones displaying all three patterns
Summary
Far from being dead and buried, many prehistoric deceased bodies are likely to have gone through a variety of different funerary rituals before becoming part of the archaeological record, most of which will remain unknown to us. The overall picture is that the human bone assemblages appear rather similar in the Late and Middle Neolithic graves In both passage- and gallery graves a variety of articulated positions are found as well as partially articulated and disarticulated skeletons, some burnt bone and a few rare cases of assemblages of certain bone elements such as skulls [1, 12, 14, 16, 23, 24]. Many graves were excavated a long time ago, some as early as the 19th and early 20th century, which means that information on exact location and position of bones and skeletons is not always available These circumstances complicate interpretations of mortuary practices in connection with burials in the megalithic graves
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