Troaon Group
Geology
Formations: Kersadiou (9), Tibidy (1)
Lithologies: siltstone (10), "limestone" (10)
Paleoenvironments: shallow subtidal indet. (1), open shallow subtidal (5), lagoonal/restricted shallow subtidal (4)
Age range: Middle Givetian or 383.00000 to 380.20000 Ma