Reference

Silvia Ortiz, Xabier Orue-Etxebarria, Juan Ignacio Baceta, Estibaliz Apellaniz, Laia Alegret (2011): New insights on the Danian/Selandian boundary in the Basque Basin, Western Pyrenees: implications for (inter)regional correlation – Berichte der Geologischen Bundesanstalt – 85: 122.