 At the so-called Franconian Line, a significant fault line, the Saxo-Thuringian-Moldanubian basement was uplifted in places up to 2000 m above the Franconian Platform.The western two-thirds of Franconia is dominated by the Triassic with its sandstones, siltstones and claystones (so-called siliciclastics) of the bunter sandstone; the limestones and marls of the Muschelkalk and the mixed, but predominantly siliciclastic, sedimentary rocks of the Keuper.In the Rhön, the Triassic rocks are overlain and intruded by volcanic rock (basalts, basanites, phonolites and trachytes) of the Tertiary.