of an Austroalpine klippe). These remaining Swiss nappes have a different tectonic and metamorphic history than their counterparts in Austria, which is why they are not always considered a part of the Austroalpine nappes. On the other hand, in Austria, the Austroalpine nappes cover the largest part of that country, except for a few windows like the Hohe Tauern window and the Engadin window. Traces of the Eo-Alpine orogenic phase Before the formation of the Alps in the lower and middle Tertiary period, the Austroalpine rocks experienced another deformation phase: the Eo-Alpine phase of mountain building that took place in the Cretaceous. The metamorphic grade increases to the east-south-east, so in a west-north-western direction, the traces become less severe. In the west of Switzerland, the event cannot be recognized. In Austria, however, Eo-Alpine eclogite lenses occur close to the Hohe Tauern window. The Eo-Alpine phase is sometimes seen as the earliest phase of the Alpine orogeny. However, after the initial mountain-building, the tectonic plates moved away from each other. The next phase was more than 50 Ma later, so the events are often seen as unrelated. References Description of the geology of Austria, website of Christof Kuhn Description of the geology of the Western and Central Alps, website of S.M. Schmid Geology of the Alps Structural geology Geology of Austria Geology of Switzerland Geology of Italy