BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Aerial photograph of Kesselspitze, Radstatt Alps, Austria. When Africa and Europe collided, immense forces compressed the deposition area of the Alpine rocks to a third of its original width. These layers of grey limestone and dark shale of the so-called Black Wall under Kesselspitze mountain (2321 metres high) were pushed into a double fold. It is around 150 metres high from its base to the peak.
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