Geological map of the Basque – Cantabrian Pyrenees with the location of seismic lines, drill holes, and field data (i.e. measurements and observations) in brown dots presented in this work. The geological maps compiled to build the thematic map presented in this work are also located: MAGNA-IGME: geological map at 1:50 000 scale from Instituto Geológico y Minero de España (IGME), GC-IGME: geological map at 1:25 000 scale from Gobierno de Cantabria and IGME, EVE: geological map at 1:25 000 scale from Ente Vasco de la Energia, ENRESA: geological map at 1:25 000 from Empresa Nacional de Residuos Radioactivos S.A., Ábalos (2016), Lescoutre (2019) and Carola (2014). See Appendix 3 for a detailed bibliography.