The main phase of the Alpine orogeny occurred during the Paleogene and Neogene (e.g. Schmid et al. 2004. Paleocene times saw continued closure of the Piemont – Liguria and Valais Oceans as well as troughs such as for instance the Cormoz High, a NNE-SSW-trending Paleozoic line in the Bresse Graben (Schori 2021).