Iron), which exhibits items from the time of mining in the region and also offers tours of the old buildings and mining tunnels. Additional articles from the mining and smelting operations can be viewed in the "Eisensaal" (Iron Hall) of Castle Murau. The famous Bessemer converter from Turrach is in the Technische Museum in Vienna today. Nature Geology The geological construction of the Turracher Höhe is characterised by various kinds of rock, as well as the effects of the tectonic movements, which became visible here and finally led to the formation of the Alps in the late Mesozoic era about 100 million years ago. The eastern Central Alps got their current structure at the end of the Tertiary Period. From the geological viewpoint, the Turracher Höhe and its further surroundings belong to the Gurktal layer, whose Paleozoic rocks slid over the more recent rock layer of the so-called Stangalm Triassic Period. On and under the course of the sliding, there are a whole series of smaller and larger deposits of siderite and limonite. Those are among the ones in Steinbachgraben and Rohrerwald near Turrach, which were the basis for the iron smelting there. The most commonly appearing minerals on the Turracher Höhe are the Gurktal phyllite (created in the Lower Silurian) and Eisenhutschiefer (Upper Silurian to Middle Devonian), and on the other side of the Gurktal layer also Altkristallin (paragneiss, mica schist, amphibolite), some of which were created in the Ediacaran Period. The narrow strips of the Stangalm Triassic Period, which lie between them, consist of limestone and dolomite. During the various ice ages of the Quaternary Period, the Turracher Höhe was glaciated. In the Würm glaciation, there were partial currents of the Mura glacier, which flowed out of the feeding area of the Niederen Tauern to the south. About 20,000 years ago, a strong warming within 1,000 to 1,500 years made the glacial net melt off. As a rare relic of the Würm ice age, there is a glacial mill west of Turracher Lake. Further effects of the glaciation can be observed in the shape of the terrain, as well as in many individual places of the Turracher Höhe. The rounded off mountain tops with tub-like depressions between them (cirques) are the results of the tectonic movements as well as the glaciation. One example of that is the Hohe Kor. There is also a further result of ice age