Rita González-Villanueva, University of Vigo, Departamento de Xeociencias Mariñas, Ourense, Spain, Armand Hernandez, Instituto Dom Luiz (IDL), Faculty of Sciences, University of Lisbon, Lisboa, Portugal, Susana Costas, CIMA, Universidade do Algarve, Faro, Portugal, Rafael Carballeira, University of Santiago de Compostela, Santiago de Compostela, Spain, Patricia Cabello, Autonomous University of Barcelona (UAB), Barcelona, Spain, Marta Pérez-Arlucea, University of Vigo, Departamento de Xeociencias Mariñas e OT, Vigo, Spain, Alberto Sáez, Universitat de Barcelona, Barcelona, Spain and Roberto Bao, Universidade da Coruña, A Coruña, Spain