Field photographs showing (A) clast-supported polygenetic breccia of the Saint-Étienne-de-Baïgorry Formation, composed of igneous rocks and Paleozoic metasediments and minor Upper Albian carbonate platform rocks; (B) matrix-supported polygenetic breccia of the Saint-Étienne-de-Baïgorry Formation made up of Paleozoic clasts and Upper Albian carbonate platform rocks from 2 cm to 1 m in diameter; and (C, D) polygenetic breccias of the Errozaté Formation made up of meter-sized blocks of Upper Albian, Cenomanian and Turonian carbonate platform rocks, Upper Triassic igneous rocks and Paleozoic sedimentary basement. UT: Upper Triassic; P: Paleozoic; Oph: Igneous rocks.