According to geologist Stefan Schmid, because the Western Alps underwent a metamorphic event in the Cenozoic Era while the Austroalpine peaks underwent an event in the <answer>Cretaceous</answer> Period, the two areas show distinct differences in nappe formations. Flysch deposits in the Southern Alps of Lombardy probably occurred in the <answer>Cretaceous</answer> or later.
When did Flysch deposits probably occur in the Southern Alps of Lombardy?
Cretaceous