国際標準模式層断面及び地点
A Global Boundary Stratotype Section and Point (GSSP), ratified by the IUGS in 2016, defines the base of the Albian as the first occurrence of the planktonic foraminiferan "Microhedbergella renilaevis" at the Col de Pré-Guittard section, Arnayon, Drôme, France.