Valanginian GSSP ratified by IUGS

The GSSP proposal to formalize the base of the Valanginian Stage defined at the base of bed VGL-B136 (19.23 m) in the Vergol section (Montbrun-les-Bains, Drôme, France) and correlated by the first appearance of the ammonite “Thurmanniceras” pertransiens was unanimously approved by the IUGS Executive Committee in December 2024.