Glarus thrust
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How it came to be
In the Sardona area of north-eastern Switzerland, the making of mountains can be seen in the rock. Along the Glarus thrust, older Permian and Triassic rocks were pushed more than 100 kilometres north over younger Jurassic, Cretaceous and Paleogene rocks.
The naturalist Hans Conrad Escher von der Linth, the first to study the thrust, noticed older rock lying on top of younger, and his son Arnold Escher mapped it in detail and concluded it could be a huge thrust. Famous places include the outcrop at Lochsite near Glarus and the Martinsloch, a hole in the cliff through which the sun shines.
An area of 32,850 hectares with seven peaks over 3,000 metres was inscribed in 2008 as an example of mountain building by continental collision. A first nomination in 2006 was turned down; the second succeeded.
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