SP Fig. 4. LA-ICP-MS U–Pb dating of Carboniferous ash layers in the Cantabrian Zone (N Spain): stratigraphic implications

SP Fig. 4. Synthetic stratigraphic section of the Puerto Ventana Stephanian succession at the Bienvenida Mine reconstructed using information of the zero, first and second levels in the mine using information of Enadimsa (1981) report. See Fig. 5 for index and a key of symbols.