PERILLI, NICOLA, MARÍA JOSÉ COMAS-RENGIFO, and ANTONIO GOY. 2004. “CALIBRATION OF THE PLIENSBACHIAN-TOARCIAN CALCAREOUS NANNOFOSSIL ZONE BOUNDARIES BASED ON AMMONITES (BASQUE-CANTABRIAN AREA, SPAIN)”. RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA 110 (1). https://doi.org/10.13130/2039-4942/6271.