Membre des Grès de Passage
Representation 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
- incorrect name (though informally used)
Nomenclature
- Deutsch
- Grenzschichten-Member
- Français
- Membre des Grès de Passage
- Italiano
- Membro dei Grès de Passage
- English
- Grès de Passage Membre
- Historical Variants
-
Grès de passage (Badoux & Gabus 1991), Grès de Passage member (Ringgenberg et al. 2001)
Description
- Thickness
- 6-26 m (Ringgenberg et al. 2001)
Hierarchy and sequence
- Superordinate unit
- Units at roof
- Units at floor
Age
- Age at top
-
- Bathonian
- Note about top
-
?
- Age at base
-
- Bathonian
- Note about base
-
?
- Dating Method
-
par encadrement
Geography
- Type area
- Vallée de la Grande Eau, entre Le Sépey et la Forclaz
Palaenography and tectonic
- 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
(
p.360: 2.1A. Grès de Passage member (Bathonian?) This member forms the transition between the Leyderry and the Forclaz members. It is around 6 m thick on the Sépey-Diablerets road and 26 m in La Forclaz gorge. It is formed by metric and decimetric calcareous turbidites, which consist of quartz, feldspars and many micritic clasts containing echinodermic fragments, spicules, foraminifers (Lenticulina, Trocholina and Syphovalvulina) and ooliths with quartz and feldspar cores. As in the Raverette member, the granulometry of the beds become finer and their thickness decreases upward. Tabd Bouma sequences can be identified.