1. Departamento de Geografía e Historia; Universidad de La Laguna, Campus de Guajara; Tenerife Spain
2. Instituto Universitario de Bio-Orgánica Antonio González; La Laguna, Campus de Guajara; Tenerife Spain
3. Department of Archaeology; Boston University; Boston USA
4. Institute for Archaeological Sciences; University of Tübingen; Germany
5. School of Earth and Environmental Sciences; University of Wollongong; New South Wales Australia