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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

From: The Cretaceous of the Swiss Jura Mountains: an improved lithostratigraphic scheme

Fig. 4

Distribution of the formations along the time axis, their calibration on ammonite zones, and major oceanographic events. Note the very unequal durations. The Poncin Member of the Perte du Rhône Formation is not indicated, as it does not occur in Switzerland. Ages and ammonite zones from the Berriasian to the middle Albian according to Reboulet et al. (2014), from the late Albian to Santonian according to Hardenbol et al. (1998). Only the subzones mentioned in the text are indicated. The approximate timing (in Ma) is taken from Hardenbol et al. (1998) for the whole column (Reboulet et al. 2014 did not furnish a time scale). Although a newer chronostratigraphic scale is available (www.stratigraphy.org), the one of Hardenbol et al. (1998) is retained because it contains the ammonite zones

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