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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

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

Fig. 4

Measured composite stratigraphic log of the Ladinian succession at Monte San Giorgio with selected biostratigraphic data, U–Pb zircon dates and proposed biostratigraphic subdivisions. The 0-m level in the stratigraphic column corresponds to Bed 85 of the Besano Formation (N. secedensis Amm. Zone) in the standard profile at locality Mirigioli (Site P. 902; Rieber 1973b). It lies 4.5 below the base of the E. curionii Amm. Zone (base of the Ladinian Stage) and 1.45 m above the volcaniclastic Bed 71 (Rieber 1973b) dated by Mundil et al. (1996, 2010). Ammonoid and daonellid occurrences after Wirz (1945), Schatz (2005) and new data from Val Porina (Daonella moussoni) and Cassina (Protrachyceras cf. P. neumayri); above the Lower Meride Limestone neither ammonoid nor age-diagnostic daonellid occurrences have been so far reported. Macrofossil occurrences within the Besano Formation are not indicated (see Brack and Rieber 1993; Brack et al. 2005). Palynomorph and radiolarian occurrences according to the present study. The radiolarian assemblages from the earliest Ladinian are correlatable with the E. curionii Amm. Zone and currently under study (see text for further discussion). Be Besano Formation, SGD San Giorgio Dolomite, LMe Lower Meride Limestone, DB Dolomitband, LKSZ, MKSZ, UKSZ Lower, Middle and Upper Kalkschieferzone

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