Field photographs showing (A) outcrop and (B) Geological map of the Bustince Formation. brown: Paleozoic basement, black: Triassic shales and evaporites, blue: pre-rift sedimentary cover, light green: Bustince Formation with pre-rift sedimentary klippes and olistolithes, dark green: post-rift turbidites; (C–G) lithologies of the Bustince Formation; (C) Polygenetic clast-supported breccia with reworked clasts of Upper Triassic igneous rocks, Lower Jurassic limestone and Lower Albian limestone; (D) polygenetic clast-supported breccia with Lower Jurassic and Lower Albian limestone clasts 0.5 to 5 cm in diameter; (E) monogenetic breccia with pebbles and cobbles of Upper Triassic igneous rocks; (F) face of the Bustince-Iriberry quarry in representing a 1.5 km² sedimentary klippe of pre-rift limestones; (G) interbedded laminated pelite; (H) interbedded siliciclastic turbidites displaying incomplete Bouma sequences.