Rhenodanubian Flysch - Lainbachtal, Bayern, Germany
N 47° 41.980 E 011° 25.410
32T E 681823 N 5285765
Rhenodanubian Flysch - Lainbachtal, Bayern, Germany
Waymark Code: WMDPDK
Location: Bayern, Germany
Date Posted: 02/10/2012
Views: 10
What's the so called Flysch [pronounced: Fliesch]?
Flysch rocks consist of alternating sedimentary Sandstone-Marl-Claystone sequences. The name flysch is a schwyzerdütsch term, and means to flow or glide. This translation leads to one of the main characteristics of flysch sediments. They tend to build sometimes large landslides. Other features were the lack of fossils and the occurrence of sole marks.
A famous example is the rhenodanubian flysch, which is part of the south german prealps.
Development of these rocks
These marine, clastic sediments were built by underwater land slides along the continental shelf. Due to the different sedimentation speed of grains with different size, a gradation took place. Bigger grains sink faster and build up the ground layer and were overlain by finer grains. These layers are some cm to meters thick. Sometimes bigger rocks and rock formations were sliding as complete package down the continental slope and disturb the sedimentation of flysch rocks. These huge slides occur in irregular periods. Between two events groove casts and dewatering marks can be formed on the soft ocean floor. Those marks were overlain by material of later events and are conserved till today. The sediments contain sometimes Chondrites, which are fossil digging channels of small sediment eating animals. Also Helminthoidea, graze leads of small snails, can be found.
Typische Flyschschichtfolge
Typical formation of flysch sediments. [Out of: Scholz, H. (1995): Bau und werden der Allgäuer Landschaft.]
The rhenodanubian flysch is older than the metamorphosis age of alpine rocks. The flysch was along a deep sea trough deposited. This trough runs along the present-day rhein-donau-line. The main sedimentation area lies around the present-day region Vorarlberg. Eatswards the sediment package is much thinner and is around the cachesite just max 10m thick. While the Alps wer built, the rhenodanubian flysch was heavily folded and disrupted.
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