Fig. 13

U–Pb age spectra of detrital zircons in Bündnerschiefer (right row) and Flysch (left row) formations in the North Penninic of the northern Prättigau half-window. Kernel density estimates (KDE) after Vermeesch (2018). Only concordant ages were selected, expressed as the ratio n = concordant/total age measurements. LA-ICP-MS measurements carried out at the Institute of Geochemistry and Petrology, ETH Zurich