CALIBRATION OF PLIENSBACHIAN CALCAREOUS NANNOFOSSIL EVENTS IN TWO AMMONITE-CONTROLLED SECTIONS FROM NORTHERN SPAIN(BASQUE-CANTABRIAN AREA). RIPS [Internet]. 2002 Mar. 31 [cited 2026 Jul. 27];108(1). Available from: https://test-ojs-unimi-it.archicoop.it/index.php/RIPS/article/view/5463