The development of the ECRIS was accompanied (and in some cases preceded) by volcanic activity over large parts of the rift system that persisted into the Quaternary. The largest volcanic centres were located to the southwest of the Limagne and Bresse Grabens, the Massif Central, at the rift triple junction at the northern end of the Upper Rhine Graben, the Vogelsberg Mountains and around the Eger Graben. The last recorded volcanic activity was a phreatomagmatic eruption in the Chaîne des Puys about 6,000 years ago.