On 9 November, Swiss Post issued its latest issue of stamps under the theme "Beautiful Swiss Countryside", this time with a souvenir sheet about the Sardona Geological Structural Zone. In the ten years since its first release, the collection has covered places such as the Bernese Oberland, the Appenzell region and the canton of Ticino.
Located on the border of the cantons of St. Gallen, Glarus and Graubünden, the Sardona Geological Structure Zone has been a UNESCO World Heritage Site since 2008 for its unique geological history.
Sadona Geological Structure Zone.
A striking feature of the area is that there is a horizontal line around the peaks of Pittsadona. The rocks above the line are older than below the line, which is contrary to the conventional geological hierarchy and suggests that the peak structure is upside down.
Sadona Geological Structure Zone.
This phenomenon, known as the "Glarus Thrust Fault", is related to the formation of the Alps, when Europe collided with the African continent, when ancient rocks met younger strata, creating a huge geological impulse, which was especially evident in Sadona.
Another local attraction is Martin Loch, a 17-metre-high natural stone window at the top of the Grosszczynjönjönbergerhorn mountain. Every spring and autumn, the sun shines through the "window" of Martinloch to the church in the village of Elm for several minutes.