Undated postglacial units are andesitic scoria cone and lava flow just west of Laguna del Maule, andesitic on the southeastern shore of Laguna del Maule, rhyolitic at Laguna del Maule and rhyodacitic (unit rcd) in the western part of the field. This rhyolitic flare-up is unprecedented the history of the volcanic field, and it is the largest such event in the southern Andes.