Stratigraphy and lithology of the Hiruraitzeta Formation (A) Lithostratigraphic column at Hiruraitzeta (location in Fig. 3); (B) fine-grained calcareous turbidites with incomplete Bouma sequences, interfingering with out-of-sequence clast-supported polygenetic breccia with clasts of Paleozoic metasediments and Late Triassic igneous rocks; (C) meter-thick polygenetic breccia with clasts of Paleozoic metasediments and Late Triassic igneous rocks; (D) monogenetic clast-supported breccia of Late Triassic igneous rocks.