The Chavola of the Sorceress, Dolmen in Alava, Spain

Neolithic Bones Reveal Socio-economic and Cultural Differences are Nothing New For Spain

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The researcher Teresa Fernández-Crespo, lead author of this study, had in a previous piece of work found demographic differences between the people buried in dolmens and those buried in caves: while male adults predominated in the dolmens, children and women were more common in the caves. This funerary variability is common across the continent of Europe, although "it has hardly ever been investigated systematically," explained the researcher.

Diet Analysis

Through this study they wanted to go further and "get to know the possible significance of the different funerary practices in a very restricted space-time sequence to see whether there could be a difference in the diet of the individuals buried in megaliths and those in caves." The key is to be found in the diet, which aside from addressing a physiological need, "also constitutes cultural and social behavior determined by various parameters. That is why we knew that through the eating patterns we could make out something about the social structure and the type of societies that had been buried in these locations," she explained.

One of the dolmens analyzed, located in Elvillar (Araba). In the background, the Cantabria mountain ridge, where the caves included in the study are located. (Credit: Teresa Fernández-Crespo / UPV/EHU)

One of the dolmens analyzed, located in Elvillar (Araba). In the background, the Cantabria mountain ridge, where the caves included in the study are located. (Credit: Teresa Fernández-Crespo / UPV/EHU)

The analysis has focused on remains in the Rioja Alavesa area, which "is an unrivalled region where the caves and dolmens are very close to each other, at an average distance of 10 km. Thanks to the available dating, we have been able to distinguish the late Neolithic and early Chalcolithic moments of the dolmens to be able to compare them with the sequences of the caves corresponding to that same period."

The work involved measuring the stable carbon and nitrogen isotopes in bone collagen. "These isotopes are used to try and reconstruct diet in the past. And the fact is that the composition of human bones is determined by the food consumed by the individual during approximately the last decade of his/her life, because bone tissue is gradually remodeled. That is no surprise because 'we are what we eat'; what happens is that in the end everything we eat is gradually incorporated into our tissue," said Fernández-Crespo.

Representative of mountain cave burial site

Representative of mountain cave burial site ( CC BY-SA 3.0 )

Different Communities or Socioeconomic Differences?

The results show that the diet of the individuals was based on "plants of the C3 type, such as cereals, because they were already being grown during that period, with a contribution from land-based animals, mainly domesticated ones (goats, sheep, cows). This seems to have been the general diet of both sepulchral types." But, in actual fact, the most important discovery is the significant differences in the carbon isotope values between caves and megaliths.

Two possible interpretations are put forward to explain this difference. "The first would be that this divergence reflects a differentiated use in certain communities that practiced different funeral rites and likewise followed different subsistence economies due to the use of different farming areas: in the case of the caves, the slopes of the Cantabria mountain ridge, and in the case of the dolmens, the more open areas of the valley," pointed out the researcher.

View of the Cantabrian Mountains from to Coriscao (2,234 m, 7330 ft), in Cantabria (Spain).

View of the Cantabrian Mountains from to Coriscao (2,234 m, 7330 ft), in Cantabria (Spain). ( CC BY 2.0 )

With respect to the second option, "the divergences in the carbon isotope values could also have emerged within the same community, where everyone belonged to the same group in which there was economic specialization. In other words, one sector of the population could, for example, have been more involved in grazing activities on the mountain ridge, and the other in agriculture in the valley, or there might have been socioeconomic differences that were expressed in the preferential access to more fertile areas or to certain foods. Those laid to rest in caves may have enjoyed a lower status and their access to better lands for agriculture may have been more restricted, whereas those buried in megaliths, the building of which required considerable investment in terms of work, may have had access to better lands (more open, more fertile ones, etc.)."

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