Membre de la Forclaz

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

Diskussion des Status

Nomenklatur

Deutsch

Forclaz-Member

Français

Membre de la Forclaz

Italiano

Membro della Forclaz

English

Forclaz Member

Herkunft des Namens

Ruisseau de la Forclaz (VD), Ormont-Dessous

Historische Varianten

Marnes et calcaires du torrent de la Forclaz (Badoux & Homewood 1978, Badoux & Gabus 1991), Forclaz member (Ringgenberg et al. 2001)

Beschreibung

Mächtigkeit

30-50 m (Ringgenberg et al. 2001)

Komponenten

• Foraminiferen
• Bivalven

Bositra buchi (Roemer 1836)

Hierarchie und Abfolge

Übergeordnete Einheit

• Formation de la Grande Eau

Hangendes

• Membre de Langy

Liegendes

• Membre des Grès de Passage

Alter

Alter Top

• Bathonien

Alter Basis

• Bathonien

Datierungsmethode

Foraminifères: Protopeneroplis striata (Weynschenk), Archeosepta platierensis (Wernli) (Badoux & Homewood 1978).

Geografie

Typusregion

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

Paläogeografie und Tektonik

• Dogger

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

p.360: 2.1.5. Forclaz member (Bathonian) Good outcrops of this member are only found in La Forclaz stream (map 1:25'000 n°1285, Les Diablerets, geographic coordinates: 571'600/133'325 to 571 '775/133'650). It is 30 to 50 m thick and composed of turbiditic sandy limestones which alternate with marls. The proportion sand/marls is 1:1 and Tabe sequences are present. The detritic elements point to a more basinal environment than for the other members: limestones with little quartz, feldspars and white micas but a lot of spicules, recrystallized echinoderms, Lenticulina, Nodosoaria and little or no resedimented platform fragments. Marls interbeds are sometimes full of Posidonia bronni or bositra and ichnofossil imprints. Homewood and Badoux (1978) found Protopeneroplis striata (WEYNSCHENK) and Archeosepta platierensis (WERNLI) which indicate a Bathonian age. The transition to the Langy member is gradual, the bed thickness and the detritic fraction increase upward.