The various ages of the items clustered in intervals when the pass of Schnidejoch was open, offering a quick route to and from the Rhone valley south of the mountains.

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He cited a study by a group of European climatic institutes that reconstructed more than a millennium of weather patterns in a region ranging from France's Rhone Valley in the west to Hungary in the east, and from Germany's Nuremberg area in the north to Italy's Tuscany in the south.

CNN: Alpine resorts feel the heat