The Villigen Formation was deposited in the Late Jurassic during the Late Oxfordian to Early Kimmeridgian (Gygi 2000a). The Schwarzbach Formation was deposited mainly in the later Early Kimmeridgian and the «Felsenkalke» and «Massenkalk» in the Late Kimmeridgian. Timelines were picked approximately at the boundaries of the formations (154.8_Oxf_300, 149.2_Kim_700, 149.2_Kim_400, 149.2_Kim_100). However, the top of the «Felsenkalke» and «Massenkalk» is a major unconformity and is therefore diachronous.