At present, only the GSSPs of the base of the Maastrichtian (Tercis-les-bains, France), the base of the Turonian (Pueblo, Colorado) and the base of the Cenomanian (Mt Risou, SE France) have been established and ratified by the International Union of Geological Sciences.

The search for the remaining GSSPs has been continued and good progresses have been made, particularly for the base of Barremian, the base of Aptian, the base of Coniacian and the base of Santonian. The Olazagutia Quarry (Spain) has been recently proposed for the base of Santonian and this proposition is under scrutiny by the ICS. We hope to get more proposals for these GSSPs ready for the next International Geological Congress in 2012.