Membre de Langy

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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
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
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

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.

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