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.[1]
| Couches de l’Aroley | |
|---|---|
| Stratigraphic range: Barremian | |
 Pierre Avoi is the type locality of the Aroley formation | |
| Type | Geological formation |
| Unit of | Valais trilogy |
| Underlies | Couches des Marmontains |
| Overlies | Brèches du Grand Fond Group |
| Thickness | Averaging 100 m (330 ft) |
| Lithology | |
| Primary | Calcitic schist |
| Other | Fine conglomerate |
| Location | |
| Coordinates | 45°41′46″N 6°44′04″E / 45.696144°N 6.734438°E |
| Region | Savoie |
| Country |  France Switzerland |
| Type section | |
| Named for | Plan Aroley |
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.[2]
The Aroley Formation can be found within the following nappes:
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.[3]
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.[2][4]
References
edit- ^ Loprieno, Andrea. "earth.unibas.ch/tecto/research/Diss_Loprieno_2001_small.pdf" (PDF). Archived from the original (PDF) on 6 March 2016. Retrieved 21 February 2013.
- ^ a b Loprieno, Andrea (2011). "The Valais units in Savoy (France): a key area for understanding the palaeogeography and the tectonic evolution of the Western Alps". International Journal of Earth Sciences. 100 (5): 963. Bibcode:2011IJEaS.100..963L. doi:10.1007/s00531-010-0595-1. hdl:20.500.11850/37751. S2CID 56379732.
- ^ "Couches de l'Aroley". Lithostratigraphisches Lexikon der Schweiz.
- ^ Tricart, Pierre-Charles de Graciansky, David G. Roberts, Pierre (2010). The Western Alps, from rift to passive margin to orogenic belt : an integrated geoscience overview (1st ed.). Amsterdam: Elsevier. p. 153. ISBN 978-0444537249.
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