Membre de la Raverette
Back to Niesen nappeRepresentation and status
- Color CMYK
- (0%,11%,26%,31%)
- Color RGB
- R: 175 G: 155 B: 130
- Rank
- lithostratigraphic Member (Subformation)
- Validity
- Unit is in Use
- Status
- valid formal name
Nomenclature
- Deutsch
- Raverette-Member
- Français
- Membre de la Raverette
- Italiano
- Membro della Raverette
- English
- Raverette Member
- Origin of the Name
-
Vallon de La Raverette (VD) - Ormont-Dessous
- Historical Variants
-
Schistes marneux noirs et lits de grès grossier de la Raverettaz (de Girard 1901), série aalénienne de la Raverette (Lombard 1975), Grès et marnes de la Raverette (Badoux & Homewood 1978, Badoux & Gabus 1991), Raverette member (Ringgenberg et al. 2001)
Description
- Thickness
- 16-40 m (Ringgenberg et al. 2001)
Hierarchy and sequence
- Superordinate unit
- Units at roof
- Units at floor
Age
- Age at top
-
- Bajocian
- Note about top
-
?
- Age at base
-
- Bajocian
- Note about base
-
?
- Dating Method
-
par encadrement
Geography
- Type area
- Vallée de la Grande Eau, entre Le Sépey et la Forclaz
Palaenography and tectonic
- Tectonic unit (resp. main category)
- Kind of protolith
-
- sedimentary
References
- Definition
-
(2001) :
The Jurassic sequence of the Niesen nappe in the region of Le Sépey - La Forclaz (Swirtzerland): witness of the Piemont rifting in the Helvetic paleogeographic domain. Bull. Soc. vaud. Sci. nat. 87/4, 353-372
2.1.2. Raverette member (Bajocian?) This member, which is 16 m thick along the Sépey-Diablerets road and around 40 m in the Grande Eau gorge, is composed at its base by calcareous microconglomeratic metric massflows with millimetric to centimetric elements, separed by thin layers of micaceous marls and calcareous sandstones. Going up in the series, the size and granulometry of the beds become finer, Tab Bouma (Bouma turbidites classification can be found in Bouma 1962) sequences and graded beddings occur. We often found incorporated ductile clasts forming extensive lenses due to compaction. In the matrix, all clasts are represented by: quartz (very often polycristalline), feldspars, black limestones with spicules (plate 1) and dolomite, there are two dominant size groups of clast ranging from mm to cm. The cement is dolomitic, probably of secondary origin.