Membre de Langy
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
- Langy-Member
- Français
- Membre de Langy
- Italiano
- Membro di Langy
- English
- Langy Member
- Origin of the Name
-
Plan du Langy (VD) - Ormont-Dessous
- Historical Variants
-
Grès de Langy (Badoux & Homewood 1978, Badoux & Gabus 1991), Langy member (Ringgenberg et al. 2001)
Description
- Thickness
- 40 m (Badoux & Gabus 1991)
Hierarchy and sequence
- Superordinate unit
- Units at roof
- Units at floor
Age
- Age at top
-
- Bathonian
- Age at base
-
- Bathonian
- Dating Method
-
Foraminifères: Protopeneroplis striata (Weynschenk), Archeosepta platierensis (Wernli) [Badoux & Homewood 1978]
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: 2.1.6. Langy member (Bathonian) The base and the middle part of this member consist of decimetric beds of coarse calcareous sandstones and argillaceous intercalations. The rest is made of metric to decametric grain flows of coarse calcareous sandstones and calcareous microconglomerates without intercalations. The elements are quartz and feldspars and contain up to 30% of limestone clasts, mainly ooliths with quartz and feldspar cores but also echinodermic fragments and foraminifera (Protopeneroplis striata and Archeosepta platierensis) which indicate a Bathonian age. In the microconglomerates, the detritic fragments are very diversified: gneiss, quartzites, dolomites, black limestones, volcanoclastic rocks and some rhyolites.