Couches du Grand Fond
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).
Hierarchy and sequence
- Subordinate units
- Units at roof
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