Photographs showing some typical field aspect of the Urdach breccia. A. General aspect. B. A layer composed of numerous angular clasts of quartzite mylonite. C. Typical aspect of the breccia in the Mer de Her area. Quartzite clasts are cemented by hydrothermal quartz with fluid inclusions of Triassic origin (Nteme, 2017). D. Aspect of the Urdach polymictic breccia near Bilatre (qzt: Ordovician (?) quartzites; m: mylonitic Paleozoic basement; tl: talcified lherzolites).

Photographies montrant quelques aspects typiques des brèches d’Urdach.