 The Periadriatic Fault, in the Gail Valley into the Karawanken mountains creates the border between the Eastern and Southern Alps.Nappes in the Penninic and Sub-Penninic superunits are exposed through normal faults such as the Lower Engadine Window, Tauern Window and Rechnitz Window.Copper ores have been mined from the Austrian Graywacke Zone since prehistoric times.