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The Couches de l’Aroley (short: Aroley Formation) are a sedimentary formation deposited during the Early Cretaceous (Barremian to Aptian). They consist of calcitic schists with dolomite clasts interbedded with finegrained conglomerates. The whole sequence is about 100 m thick. The Couches de l’Aroley are the lowest of the three post-rift sequences deposited in the Valais ocean. It overlies syn-rift sequences of the Brèches du Grand Fond Group. The Aroley Formation can be found within the following nappes: *External Valais * *Moûtiers unit * *Roc de l'Enfer unit * *Petit St. Bernard unit *Internal Valais * *Versoyen unit The type locality is the Massif de la Pierre Avoi, in Saxon, Valais, Switzerland. The formation is named after a "Plan Aroley" which lies below the Pierre Avoi. It was first described by Rudolf Trümpy 1952.〔(【引用サイトリンク】url=http://www.stratigraphie.ch/?page=details&strat=Penninikum_W&id=5002 )〕 The Couches de l’Aroley can be correlated with the Klus Formation and the Tristel Formation found in eastern Switzerland, the Engadin window and the Tauern window.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aroley Formation」の詳細全文を読む スポンサード リンク
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