Trisha Shetty (Editor)

Aroley Formation

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Type  Geological formation
Thickness  Average of 100 m
Other  Fine conglomerate
Region  Savoie
Underlies  Marmontains Formation
Unit of  Valais trilogy
Primary  Calcitic schist
Country  France
Overlies  Grand Fond Group
Aroley Formation httpsuploadwikimediaorgwikipediacommonsthu

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.

    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

    Aroley Formation Wikipedia


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