Tête d'Auferrand, Mountain summit in Bornes massif, France
Tête d'Auferrand is a 1,981-metre summit on an east-west ridge between the Col de la Colombière and the Col des Annes, above Le Reposoir. It belongs to the Annes klippe, a displaced geological unit where Lower Jurassic calcareous clays rest on Upper Jurassic and Upper Cretaceous flysch.
The summit belongs to the Annes klippe, a detached block of Lower Jurassic calcareous clay that was thrust over younger Upper Jurassic and Upper Cretaceous flysch. This allochthonous formation now rests amid the predominantly limestone terrain of the Bornes massif and the Aravis chain.
Shepherds use the slopes as summer grazing land for their herds, a tradition that shapes the landscape seasonally. This pastoral practice remains an important part of life in the surrounding valleys.
Both marked trails start at the Col de la Colombière, northwest of the summit: one climbs via the Pointe de la Botte (1,807 m), the other via the Combe des Fours to the east. The summit stands at 1,981 m on the ridge between the Col de la Colombière and the Col des Annes, above Le Reposoir.
The summit belongs to the Annes klippe, an allochthonous slice of Lower Jurassic calcareous clays resting on younger Upper Jurassic and Upper Cretaceous flysch. The older rocks therefore sit above the younger ones, a reversed order geologists call a thrust sheet.
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