1. Department of Chemical and Geological Sciences; University of Modena and Reggio Emilia; via Campi 103 Modena 41125 Italy
2. Lamont-Doherty Earth Observatory of Columbia University; 61 Route 9W Palisades NY 10964 USA
3. Department of Life Sciences; University of Modena and Reggio Emilia; via Giuseppe Campi, 287 Modena 41125 Italy
4. Department of Cultural Heritage; University of Bologna; via degli Ariani 1 Ravenna 48121 Italy