Bletterbach
| Bletterbach | ||
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| Data | ||
| location | Aldein , South Tyrol , Italy | |
| River system | Etsch | |
| Drain over | Schwarzenbach → Etsch → Adriatic Sea | |
| source | at the Weißhorn 46 ° 21 ′ 21 ″ N , 11 ° 26 ′ 24 ″ E |
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| muzzle | in the municipality of Aldein in den Schwarzenbach Coordinates: 46 ° 20 ′ 43 ″ N , 11 ° 21 ′ 13 ″ E 46 ° 20 ′ 43 ″ N , 11 ° 21 ′ 13 ″ E
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The Bletterbach is a brook in the area of the Regglberg municipality of Aldein in South Tyrol . At the foot of the 2317 m high Weißhorn it forms the Bletterbach Gorge , which is also known as the "Grand Canyon of South Tyrol". The gorge was formed around 15,000 years ago in the Ice Age, is around 8 km long and 400 m deep. It is known for the numerous fossil finds and the various rock layers of the Dolomites .
The Bletterbach is part of the Dolomites UNESCO World Heritage Site .
Geological profile
The lowest rock layers that are exposed in the Bletterbach belong to the Etschtaler volcanic group , which is also called Bozener quartz porphyry . These are volcanic rocks formed around 280 million years ago .
The sedimentary rocks of the Val Gardena Formation, which is also still Permian, lie on the rocks of the Etschtal volcanic group with a thickness of 250 meters . The mainly reddish color of the sandstones is striking . In the lower part there are mostly river deposits in which different sediment structures such as ripple marks , cross stratification , oblique stratification or dry cracks can be seen. In the upper part the rocks show an increasing marine influence. The fossil-rich, carbonate cephalopod bank on the upper edge of the Butterloch waterfall is known here. The Val Gardena formation is penetrated by some volcanic dikes and in the area of the Butterloch there is a striking chimney breccia . The volcanic rocks have a Triassic age, their formation is dated to the Ladinian or Carnian .
At the end of the valley, the Upper Permian Bellerophon Formation, which is around 60 meters thick, is exposed above the Val Gardena Formation . The rocks are influenced by evaporitic , partly also bituminous . A transgressive tendency towards the top can also be seen in the Bellerophon Formation, which means that the sediments, which are even more terrestrial below, are increasingly formed in the sea towards the top.
With an oolite bank a few meters thick , the Werfen formation , which originated in the lower Triassic, begins above the Bellerophon formation . The strongly differentiated formation goes back in part to the formation of a Wadden Sea . The Richthofen conglomerate follows above the Werfen formation and the Sarldolomit above that . Both are dated to the Middle Triassic, the Anisium . The Sarldolomit also builds up the summit of the Weißhorn .
gallery
literature
- Helmut Moser: Bletterbach in Aldein: South Tyrol's Cañon - Geology on the Reggelberg . Bolzano: Athesia 1996. ISBN 88-7014-894-7
- Marco Loppi and Christian Aspmair: Geo-Lehrpfad Bletterbach. Geological hiking guide through the Bletterbach Aldein-Radein . Aldein: Museum Association 1998.
- Heiko Boden: The Bletterbach in South Tyrol - Europe's most fascinating canyon . Deutschnofen: Brunner 2008.
- Evelyn Kustatscher and Marco Avanzini: The Bletterbach Gorge. Stories in stone . Aldein: GEOPARC Bletterbach 2011
Web links
- Geoparc Bletterbach
- The Bletterbach Gorge in the Dolomites World Heritage Site
Individual evidence
- ↑ http://www.provinz.bz.it/natur-raum/themen/Zum%20Lesen%20und%20Schauen.asp?somepubl_action=300&somepubl_image_id=312946 Dolomites UNESCO World Heritage (brochure) PDF
- ↑ Gerhard Niedermayr: The Bletterbach Gorge near Radein (Redagno) - A hike through 50 million years of geological history. In: Communications from the Austrian Mineralogical Society. Vol. 153, 2007. PDF file
