Belchen-Member
Représentation et statut
- Couleur CMYK
- (0%,12%,20%,2%)
- Couleur RGB
- R: 250 G: 220 B: 200
- Rang
- Membre lithostratigraphique (Sous-formation)
- Usage
- Ce terme est en usage.
- Status
- terme formel valide
- Scs Date
- 01.01.2014
- Discussion du statut
-
Berg eher als Dörflein => "du Belchen" auf Französisch
Nomenclature
- Deutsch
- Belchen-Member
- Français
- Membre du Belchen
- Italiano
- Membro del Belchen
- English
- Belchen Member
- Origine du nom
- Variantes historiques
-
«Oberer Keuper» auct., «Rhät-Sandstein» auct., Rhétien (Caire 1970), Belchen Member (Jordan 2016, Jordan et al. 2016)
Description
- Description
-
Vorwiegend mittelkörnige, gutsortierte, meist karbonatfreie, quarzitische Sandsteine mit tonigen, mergeligen Zwischenlagen.
- Épaisseur
- bis 6 m
Hiérarchie et succession
- Unité hiérarchiquement supérieure
- Unités sus-jacentes
- Unités sous-jacentes
- Limite supérieure
-
transgressiv
- Limite inférieure
-
Einsetzen einer Sandstein-Abfolge
Âge
- Âge au sommet
-
- Rhétien
- Âge à la base
-
- Rhétien
Géographie
- Extension géographique
- Nur in der Nordwestschweiz und im Bodensee-Gebiet.
- Localité-type
-
-
Chilchzimmersattel (BL)
Particularités du site- Obergrenze
- Untergrenze
- typische Fazies
- Strassenanschnitt / Bahnanschnitt
- (2627740 / 1246130)
- <p>Nordwestlich der Belchenflue (Erni 1910 und 1912)</p>
-
Chilchzimmersattel (BL)
- Typusprofil
-
-
Chilchzimmersattel (BL), am Belchen
Particularités du site- Obergrenze
- Untergrenze
- typische Fazies
- Strassenanschnitt / Bahnanschnitt
- (2627740 / 1246130)
- Erni 1910 und 1912
-
Chilchzimmersattel (BL), am Belchen
Paléogéographie et tectonique
-
- Trias du Jura
- Paléogéographie
- Bassin germanique
- Termes génériques
-
-
Jura
:
Juragebirge
-
Jura
:
- Type de protolithe
-
- sédimentaire
- Conditions de formation
-
"The lower part of the Belchen Member documents a brackish estuarine to marine environment, where open sea was located to the West, and is interpreted as a seaway connecting the Tethys with the marine Germanic Basin (Beutler and Nitsch 2005). With time the estuarine facies became progressively restricted towards east. It was replaced increasingly by shallow marine sandstones and finally by silstone and marl. This succession was later cut by regional erosion of Late Triassic or Early Jurassic age, which cut deepest in central northern Switzerland (Aare Massif–Black Forest High, e.g. Trümpy 1980)" (Jordan et al. 2016).
- Séquence
-
5. regressiver Zyklus der Klettgau-Formation.
- Métamorphisme
- non métamorphique
Références
- Définition
-
(2016) :
The middle to late Triassic Bänkerjoch and Klettgau formations of northern Switzerland. Swiss J. Geosc. 109/2, 257-284
The Belchen-Member (formerly “Rhät-Sandstein”) consists of partly fossiliferous coarse grained sands and greenish dark marls of estuarian to shallow marine origin. The sandstones are characterized by the bright saccharoid weathering. Due to late Triassic and early Jurassic erosion, Belchen-Member is restricted to North-western Switzerland and Lake Constance area. (Jordan et al. 2015)
Description: Predominantly middle-grained, wellsorted, mostly carbonate-free quartzitic sandstone with thin shale interlayers overlain by dark marl and claystone with sandy interlayers and burrows, bonebeds (Jordan et al. 2016).