Palaeolithic diet included snails 10,000 years earlier than previously thought


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Palaeolithic inhabitants of modern-day Spain may have eaten snails 10,000 years earlier than their Mediterranean neighbors, according to a study published August 20, 2014 in the open-access journal PLOS ONE by Javier Fernandez-Lopez de Pablo from Institut Catala de Paleoecologia Humana i Evolucio Social and colleagues.

Palaeolithic diet included snails 10,000 years earlier than previously thought
Fossilized snail shells [Credit: Fernandez-Lopez de Pablo et al.]

Snails were widespread in the Late Pleistocene and Holocene, but it is still unknown when and how they were incorporated into human diets. The authors of this study found land snail shell remains from ~30,000 years ago at a recently discovered site in Cova de la Barriada, Spain. To better understand if the inhabitants may have eaten snails, the researchers investigated patterns of land snail selection, consumption, and accumulation at the site, and then analyzed the shells’ decay, fossilization process, composition, and age at death by measuring the shell size.

Palaeolithic diet included snails 10,000 years earlier than previously thought
(A) Spatial association of land snails to carbonaceous sediments and fire-cracked stones of 
combustion structure EC-1, (B) spatial association of land snails, bone fragments and
 lithic artifacts of level C, (C) combustion structure BM containing land snails and
 homogenous carbonaceous sediments; (D) land snails found into the combustion structure BM, 
(E) morphology of the combustion structure BM once excavated (maximum length 41 cm), 
(F) burning traces of I. alonensis found into the filling sediment of combustion structure BM. 
[Credit: Fernandez-Lopez de Pablo et al.]

Scientists found groupings of complete shells from a large land snail species at three areas of the site, corresponding to different time points ~30,000 years ago. The adult snails were close to prehistoric human-constructed structures that may have been used to cook the snails, along with stone tools, and other animal remains that were likely roasted in ambers of pine and juniper at 375 C. The authors posit that these results point to previously undiscovered patterns of invertebrate use and may highlight a broadening of the human diet in the Upper Paleolithic in the Mediterranean basin. In neighboring Mediterranean areas, eating land snails didn’t appear until about 10,000 years later, which may make these newly found snail shells the oldest known evidence that ancient human populations used them as a food resource in Europe ~30,000 years ago.

Source: PLOS [August 20, 2014]



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