Table 1.

Summary of U–Pb geochronology results for ash beds and intrusions from Bagolino, Punta Grohmann, Predazzo and Monzoni.

SampleStratigraphic position at Bagolino (m)*Youngest 206Pb/238U date (Ma)95% CI, X/Y/Z (Ma)Weighted mean 206Pb/238U date (Ma)95% CI, X/Y/Z (Ma)MSWDBayesian model date§ (Ma)95% CI† (Ma)
BG-CG−8.83242.6210.083/0.17/0.31242.6530.036/0.12/0.290.50242.5810.092/0.12/0.29
FEO-2W241.970.15/0.16/0.29242.0100.050/0.088/0.260.62241.9890.061/0.095/0.28
SEC-BW0.00241.640.13/0.15/0.28241.7050.045/0.093/0.290.34241.6470.091/12/0.29
SEC-CW241.980.11/0.13/0.27Out of stratigraphic order/no w. mean Bayesian eruption date estimate calculated
SEC-DW240.450.18/0.19/0.31240.5760.042/0.084/0.250.81240.5630.054/0.090/0.28
FEO-12W240.390.11/0.13/0.27240.4280.049/0.087/0.260.37240.380.10/0.12/0.29
SEC-EW11.46240.190.13/0.15/0.28240.2850.036/0.081/0.251.90240.2390.084/0.11/0.29
SEC-GW238.940.12/0.14/0.28239.0440.038/0.081/0.252.10238.9410.091/0.12/0.29
BG-92.225.89238.6260.069/0.14/0.29238.6430.037/0.11/0.280.77238.570.18/0.19/0.33
MON-Md238.160.11/0.15/0.30238.1900.050/0.11/0.280.87237.610.18/0.19/0.33
MON-SD238.0780.091/0.14/0.29238.1370.050/0.13/0.291.10237.5150.083/0.11/0.28
PRE-Md237.810.43/0.44/0.51238.0750.087/0.15/0.292.20237.910.15/0.17/0.31
PG-A237.6700.075/0.16/0.30237.6800.047/0.13/0.280.50238.1240.061/0.094/0.28
PG-B237.5090.084/0.15/0.30237.5790.042/0.12/0.282.79237.810.28/0.29/0.39
GSSP levelM2.39241.320.15/0.16/0.31241.3930.123/0.14/0.30241.330.14/0.16/0.31

* Stratigraphic positions refer to the Bagolino zero-tuff log.

Uncertainties are given as 95% confidence intervals (CI) at three levels of uncertainty propagation: X is the analytical uncertainty; Y includes X and the tracer calibration uncertainty (Condon et al. 2015); Z includes X, Y and the 238U decay constant uncertainty (Jaffey et al. 1971).

MSWD, mean square weighted deviation.

§ Bayesian eruption age estimate after Keller et al. (2018).

M Values for Anisian–Ladinian GSSP level at Bagolino zero-tuff log calculated with BACON Bayesian age modelling software after Blaauw & Christen (2011).

W Results from Seceda and Passo Feudo are taken from Wotzlaw et al. (2018) with recalculated Bayesian eruption age estimates.