Early late Albian (Cretaceous) of the central region of the Basque-Cantabrian Basin, northern Spain: biostratigraphy based on ammonites and orbitolinids

1. Lopez-Horgue, M.A.
2. Owen, H.G.
3. Aranburu, A.
4. Fernandez-Mendiola, P.A.
5. Garcia-Mondéjar, J.