Wengen Group, La Valle Formation
230 million years ago, during the upper Ladinian stage, in the parts of the sea
located to the west and south of the Cortina d'Ampezzo basin, volcanic eruptions
occurred with the formation of islands. Following the erosion of these islands,
dark deposits were produced called â€śvolcanoclasticsâ€ť.
In these rocks, besides marine organisms (lamellibranchia and ammonites), important plant fossil remains have been found indicating that tropical forests grew on the lands above sea level.