Working Groups

Task group: Revision of the GSSP for the base of the Tournaisian; proposal for GSSP anticipated for 2027

Task group: Establishment of a GSSP for the base of the Serpukhovian

Task group: Establishment of a GSSP for the base of the Moscovian; proposal for criterion anticipated for 2027,

Task group: Establishment of a GSSP for the base of the Kasimovian and Gzhelian; Kasimovian: proposal for criterion anticipated for 2026; Gzhelian: GSSP proposal in voting process