Membre de la Leyderry
Back to Plaine-MorteRepresentation 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
- Leyderry-Member
- Français
- Membre de la Leyderry
- Italiano
- Membro della Leyderry
- English
- Leyderry Member
- Origin of the Name
-
La Leyderry (VD), Ormont-Dessous
- Historical Variants
-
Conglomérat du Leyderry (Badoux & Homewood 1978, Badoux & Gabus 1991), Leyderry member (Ringgenberg et al. 2001), conglomérat du Lédery [sic] (Carrupt 2003)
Description
- Thickness
- 100-120 m (Badoux & Gabus 1991), 25-50 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 analogie avec les oolites de la Formation de l'Infra-Niesen (Lempicka Münch 1996).
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: 2.1.3. Leyderry member (Bathonian?) These polygenic conglomerates are 50 m thick along the Sépey-Diablerets road and less than 25 m in the Grande Eau gorge. They have no internal structures (disorganized conglomerates) and elements are decimetric. The main elements are dolomites, gneiss, quartzites, black limestones, rhyodacites, dolerites, rhyolites, green sandstones, volcanoclastic rocks and green rocks of probable metamorphic origin. The calcareous gritty matrix looks like the Raverette member but we can find contemporaneous resedimented ooliths from the base to the top of the member. Based on an analogy with the findings of Lempicka Munch (1996) on the Infra-Niesen Fm, in which ooliths are of Bathonian age, we assumed that ooliths described herein are also of Bathonian age. Therefore, a Bajocian age is assumed for the underlying Raverette member, in which no ooliths are found.