1. Department of Archaeology and Anthropology, University of Bristol, 43 Woodland Road, Bristol BS8 1UU, UK.
2. Bristol Isotope Group, School of Geographical Sciences, University of Bristol, University Road, Bristol BS8 1SS, UK.
3. Centro Nacional de Investigatión sobre la Evolución Humana (CENIEH), Paseo Sierra de Atapuerca s/n, 09002 Burgos, Spain.
4. Department of Geography, Prehistory and Archaeology, University of Basque Country (UPV/EHU), c/ Tomás y Valiente s/n, 01006 Vitoria,Spain.
5. Department of Archaeology, University of Sheffield, Northgate House, West Street, Sheffield S1 4ET, UK.
6. Prehistory Section, University of Alcalá de Henares, c/ Colegios 2, 28801 Alcalá de Henares, Madrid, Spain.
7. Department of Historic Sciences, University of Cantabria, Avenida Los Castros s/n, 39005 Santander, Spain.
8. Museo Nacional y Centro de Investigación de Altamira. 39330 Santillana del Mar, Cantabria, Spain.
9. University of Barcelona/Institució Catalana de Reserca i Estudis Avançats (ICREA), Departament de Prehistòria, Història Antiga i Arqueologia (SERP), c/ Montalegre 6, 08001 Barcelona, Spain.