Belchen-Member
Torna a Klettgau-FormationRappresentazione e statuto
- Colore CMYK
- (0%,12%,20%,2%)
- Colore RGB
- R: 250 G: 220 B: 200
- Rango
- Membro litostratigrafico (Sotto-formazione)
- Uso
- Unità in uso.
- Status
- termine formale valido
- SCS data
- 01.01.2014
- Discussione del statuto
-
Berg eher als Dörflein => "du Belchen" auf Französisch
Nomenclatura
- Deutsch
- Belchen-Member
- Français
- Membre du Belchen
- Italiano
- Membro del Belchen
- English
- Belchen Member
- Origine del nome
- Varianti storiche
-
«Oberer Keuper» auct., «Rhät-Sandstein» auct., Rhétien (Caire 1970), Belchen Member (Jordan 2016, Jordan et al. 2016)
Descrizione
- Descrizione
-
Vorwiegend mittelkörnige, gutsortierte, meist karbonatfreie, quarzitische Sandsteine mit tonigen, mergeligen Zwischenlagen.
- Potenza
- bis 6 m
Gerarchia e successione
- Unità di rango superiore
- Unità sovrastante
- Unità sottostante
- Limite superiore
-
transgressiv
- Limite inferiore
-
Einsetzen einer Sandstein-Abfolge
Età
- Geomorfologia
-
- Retico
- Età alla base
-
- Retico
Geografia
- Estensione geografica
- Nur in der Nordwestschweiz und im Bodensee-Gebiet.
- Località-tipo
-
-
Chilchzimmersattel (BL)
Caratteristiche del sito- Obergrenze
- Untergrenze
- typische Fazies
- Strassenanschnitt / Bahnanschnitt
- (2627740 / 1246130)
- <p>Nordwestlich der Belchenflue (Erni 1910 und 1912)</p>
-
Chilchzimmersattel (BL)
- Sezione-tipo
-
-
Chilchzimmersattel (BL), am Belchen
Caratteristiche del sito- Obergrenze
- Untergrenze
- typische Fazies
- Strassenanschnitt / Bahnanschnitt
- (2627740 / 1246130)
- Erni 1910 und 1912
-
Chilchzimmersattel (BL), am Belchen
Paleogeografia e tettonica
-
- Trias (Jura)
- Paleogeografia
- Germanic basin
- Termini generici
-
-
Jura
:
Juragebirge
-
Jura
:
- Tipo di origine
-
- sedimentaria
- Condizioni di formazione
-
"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).
- Sequenza
-
5. regressiver Zyklus der Klettgau-Formation.
- Metamorfismo
- non metamorfo
Referenze
- Definizione
-
(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).