Membre de la Raverette

Darstellung und Status

Farbe CMYK

(0%,11%,26%,31%)

Farbe RGB

R: 175 G: 155 B: 130

Rang

lithostratigraphisches Member (Subformation)

Gebrauch

Element ist in Gebrauch

Status

gültiger formeller Begriff

Nomenklatur

Deutsch

Raverette-Member

Français

Membre de la Raverette

Italiano

Membro della Raverette

English

Raverette Member

Herkunft des Namens

Vallon de La Raverette (VD) - Ormont-Dessous

Historische Varianten

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)

Beschreibung

Mächtigkeit

16-40 m (Ringgenberg et al. 2001)

Hierarchie und Abfolge

Übergeordnete Einheit

• Formation de la Grande Eau

Hangendes

• Membre de la Leyderry

Liegendes

• Membre des Schistes à Miches

Alter

Alter Top

• Bajocien

Bermerkungen zu Top

?

Alter Basis

• Bajocien

Bermerkungen zu Basis

?

Datierungsmethode

par encadrement

Geografie

Typusregion

Vallée de la Grande Eau, entre Le Sépey et la Forclaz

Paläogeografie und Tektonik

Tektonische Einheit (bzw. Überbegriff)

• Ultrahelvetic

Herkunftstyp

• sedimentär

Referenzen

Erstdefinition

Badoux H., Homewood P. (1978) : Le soubassement de la nappe du Niesen dans la région du Sépey (Alpes vaudoises). Bull. Soc. vaud. Sci. nat. 74/1, 15-23

Neubearbeitung

Ringgenberg Yann, Tomassi Alexander, Stampfli Gérard M. (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.