New data on the age of the installation of Urgonian-type carbonates along the northern Tethyan margin: biostratigraphy of the Chopf Member (Helvetic Alps, eastern Switzerland)

Stéphane Bodin; Jean Vermeulen; Alexis Godet; Karl B. Föllmi

Comptes Rendus. Géoscience, Volume 338 (2006) p. 727-733