Quarry at the Schanz
The quarry on the Schanz (locally also Grüntensteinbruch ) on the vineyard between Rettenberg and Burgberg in the Allgäu is a geotope in the natural area of the Vilser Mountains and the geological unit of the Allgäu Molasse foothills. The property was developed as a quarry and consists of sandstone and limestone . It is one of the 100 most beautiful geotopes in Bavaria .
The quarry was opened up in the 1930s, and in 1978 the industrial operation was taken over by an Allgäu bitumen mixing company. At the end of 1999 the mining permit expired, a reactivation of the quarry in 2009 failed due to the resistance of the population from Burgberg.
Description of the sequence of layers
In the quarry, the steeply south-dipping strata of the shed zone of the South Helvetic part of the green part cover are exposed in the form of a fold . The view of the disclosed, complete sequence of layers enables an insight into the course of the sedimentation and the tectonics in the Helvetic. The oldest rocks are developed in the fold core. The thick, greenish-gray, quartz-rich Brisis sandstone is overlaid by green sandstones from the Garschella formation. Above these sandstones lies the paved, light gray fossil-bearing sea limestone, which is overlaid in the south by the Amden layers.
Today the bottom of the pit has been recultivated because it has not been mined since 2000.
The geotope was classified in 2011 by the Bavarian State Office for the Environment as regionally important (geotope no. 780A001) with a suitability as an excursion and research object. The calcareous sedimentary rocks contain various fossil remains as former marine deposits. The geotope has a length of 250 meters, a width and height of 70 meters each and an area of 17,500 m².
Petrography of the open layer sequence
The gray to green-blue, fine-grained green sandstone of the Aptium was used as stone . It is a quartz sandstone with a high glauconite content . Geologically, it is a so-called molasse sandstone . Anatase with a size of 4 mm can be present in the rock as an accessory .
In the Upper Cretaceous Seewerkalk there are subordinate pyrite , marcasite in dark gray areas, calcite in the cavities of the calcite veins, white to clear calcite crystals up to several centimeters in size, mostly as scalenohedra. Strontianite is rarely found , which then often coats the calcite.
See also
Individual evidence
- ↑ Helvetikum am Burgberg. In: Bavarian State Office for the Environment (Hrsg.): Hundred masterpieces - The most beautiful geotopes of Bavaria . Augsburg 2012, 2nd edition, ISBN 978-3-936385-89-2 , pp. 204f.
- ^ Quarry Burgberg am Grünten (Allgäu). In: mineralienfreunde.de (accessed on May 2, 2015)
- ↑ Citizens' initiative against the Burgberger Steinbruch eV (accessed on May 2, 2015)
- ↑ Bavaria's most beautiful geotopes, display board N.88: Helvetikum am Grünten , accessed on May 2, 2015
- ↑ Geotope data sheet of the Bavarian State Office for the Environment: Geotope no. 780A001 Quarry at the Schanz , accessed on May 2, 2015
- ↑ Grünten sandstone. In: geodienst.de (accessed on May 2, 2015)
Web links
Coordinates: 47 ° 32 ′ 40.9 ″ N , 10 ° 16 ′ 58 ″ E