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Fig. 10 | Swiss Journal of Geosciences

Fig. 10

From: Integrated Ladinian bio-chronostratigraphy and geochrononology of Monte San Giorgio (Southern Alps, Switzerland)

Fig. 10

Correlation of the Ladinian composite section at Monte San Giorgio with the GSSP-section at Bagolino. In order to illustrate the proposed lithologic and biostratigraphic correlation, the metric log scales differ by an order of magnitude (1 m in the Bagolino section = 10 m in the Monte San Giorgio section). Earlier U–Pb zircon ages indicated for Bagolino and Seceda are from Mundil et al. (1996; samples BAG and SEC, air-abrasion pre-treatment technique) and for Monte San Giorgio from Mundil et al. (2010; sample MSG, CA pre-treatment technique). See text for a short discussion of the older apparent ages at Seceda and Bagolino. Possible correspondences of volcaniclastic layers are established using the age trend suggested for Bagolino (Brack et al. 2007: fig. 11). On this trend the red squares mark the position of the new radio-isotopic ages. Red arrows indicate the inferable width of the correlatable stratigraphic intervals at Bagolino and the red dotted lines indicate possibly corresponding horizons, also taking into account the biostratigraphic constraints. Important reference localities and the distribution of lower Ladinian units are shown in a sketch map of the Southern Alps (after Brack and Rieber 1993)

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