Couches du Grand Fond

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Representation and status

Color CMYK
(0%,0%,0%,100%)
Rank
lithostratigraphic Group
Validity
Unit is in Use
Status
local name (informal)

Nomenclature

Deutsch
Grand-Fond-Schichten
Français
Couches du Grand Fond
Historical Variants
couches de l'Aiguille du Grand Fond (Schoeller 1929), couches de l'Aiguille du Grand Fond et série conglomératique [de la zone des Brèches de Tarentaise] (Trümpy 1955), Schichten der Aiguille du Grand Fond (Fricker 1960), Brèche du Grand Fond (Antoine et al. 1972, Fudral 1973, Fügenschuh et al. 1999), Brèche du Grand Fond Group (Loprieno 2001)

Description

Thickness
Max. 40 m (Trümpy 1955).

Age

Age at top
  • Early Cretaceous
Note about top
pre-Barremian
Age at base
  • Middle Jurassic
Note about base
Late Liassic

Geography

Geographical extent
Pierre Avoi (VS) et Tarentaise.
Type area
Tarentaise (France)

Palaenography and tectonic

Paleogeography
Valaisan Basin
Tectonic unit (resp. main category)
  • Formation des Pyramides Calcaires

    Rank
    lithostratigraphic Formation
    In short
    Schistose syn-rift sediments: brownish calcschists and characteristic alternance between black shales and fine calcareous sandstones, as well as more chaotic sequences.
  • Formation de la Dent d'Arpire

    Name Origin
    Dent d'Arpire
    Rank
    lithostratigraphic Formation
    In short
    Syn-rift sediments: series of well bedded, matrix-supported, polymictic breccias with marly matrix at the base, followed by pure limestone. Massive thick conglomerate with mainly dolomite clasts in a light grey to bluish limestone matrix at the top.
    Age
    Toarcian
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