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Silvretta Crystalline

by Theresa K├Ânig last modified 2007-06-06 15:08

Some of these rocks are more than 1.5 billion years old. They were metamorphosed during three mountain building phases which are called orogenies.The last decisive metamorphic overprint took place about 325 million years ago. Over the next 200 million years the sedimentary rocks were sedimented on the basement of the Silvretta Crystalline.


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