1. Centro de Astrobiología (INTA-CSIC); Torrejón de Ardoz Spain
2. Consultant Geologist; Sabadell Spain
3. Centro de Biología Molecular Severo Ochoa; Universidad Autónoma de Madrid; Madrid Spain
4. ESCET, Área de Geología; Universidad Rey Juan Carlos; Móstoles Spain
5. Department of Earth Sciences; The University of Western Ontario; London Ontario Canada
6. Now at Hyperspectral Optical Sensing for Extraterrestrial Reconnaissance Laboratory, Department of Geography; University of Winnipeg; Winnipeg Manitoba Canada
7. Nanotechnology Platform; Institute for Bioengineering of Catalonia; Barcelona Spain
8. Departamento de Paleontología, Facultad de Ciencias Geológicas; Universidad Complutense de Madrid; Madrid Spain