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Volcanic ash layers in the Upper Cretaceous of the Central Apennines and a numerical age for the early Campanian

Bernoulli, Daniel ; Schaltegger, Urs ; Stern, Willem ; Frey†, Martin ; Caron, Michèle ; Monechi, Simonetta

In: International Journal of Earth Sciences, 2004, vol. 93, no. 3, p. 384-399