 The building of the Alps continued, as some units subsided 60 kilometers below the surface, metamorphosing under high pressure.Eclogite and blueschist in the Sub-Penninic Superunit and Penninic Superunit are seen as evidence of the extent of metamorphism.Igneous activity formed tonalite, granite and basalt between five and 25 kilometers depth, while volcanoes were active on the surface.