Today, when we approach any one of the steep and high walls which attract ambitious climbers in the alps, we see large scree fields (Geröllfelder in German) below the walls. It
is hard to imagine that these fields where formed by rocks falling down with a frequency that was normal in the years around 1970 (the time from which my personal experience
with falling rocks date). So the idea came to my mind that the scree fields are the debris
of considerably higher mountains which were formed during interglacial periods due to
a retreat of permafrost. For this matter it would be interesting to know whether there were activities to determine the age of the rocks at the ground of alpine scree fields. (This would be obviously more difficult than getting probes of ice from the ground layers of alpine glaciers).
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