 Incapillo is a Pleistocene caldera , a depression formed by the collapse of a volcano , in the La Rioja province of Argentina . Part of the Argentine Andes , it is considered the southernmost volcanic centre in the Central Volcanic Zone of the Andes with Pleistocene activity . Incapillo is one of several ignimbritic or <unk> systems that , along with 44 active stratovolcanoes , are part of the Central Volcanic Zone . 
