C. Benazet, P. Brenu, E. Canet, R. Grandin, R. Guiguet et al., for helping us in the sampling, at the Magnola site and many others in the Lazio-Abruzzo region. L. Sevin, J. Marin and all the staff at SARM-CRPG (France) are acknowledged for the chemical measurements. We are very thankful to T. Guilderson and T. Brown as well as all the staff of the CAMSLLNL (California) for their precious assistance and support for the 36 Cl measurements. All the people of the Forme village and specially A. Ercole are greatly acknowledged for their help and support. We also are very thankful to the regione Abruzzo and Lazio as well as the Corpo Forestale, We thank J. Malavieille for fruitful discussions and help on the field

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