The land snail midden from Balma del Gai (Barcelona, Spain) and the evolution of terrestrial gastropod consumption during the late Palaeolithic and Mesolithic in eastern Iberia

The aim of this paper is to describe the results of a study of the terrestrial gastropods recovered at the Epipalaeolithic site Balma del Gai, and comparing it with other Upper Palaeolithic and Epipalaeolithic samples from the Mediterranean region of the Iberian Peninsula. Balma del Gai is located in north-eastern Spain, in the municipality of Moià, province of Barcelona. This small rock shelter lies about 50 km inland from the coast. The second layer, the middle one, (Nivell I) contains diverse Epipalaeolithic occupations dated from 12,240 ± 110 BP to 8930 ± 140 BP. A large amount of terrestrial gastropod shells was recovered during archaeological excavations. These shells belong to the species Cepaea nemoralis, which is very common in other contemporaneous sites from the region. The anthropic origin of the sample has been confirmed by a previous taphonomic study. New results reveal an evolution in the use of land snails as a food resource from south to north in Mediterranean Iberia: consumption of land snails began in the south with the warmer stages at the end of the Pleistocene and extended northwards during the Holocene. However, land snails were most likely only a seasonal food source, and their presence is probably correlated with the exploitation of other resources such as small mammals (rabbits) and collected plants and fruits.