Schönbühl-Formation

Rappresentazione e statuto

Colore CMYK

(0%,45%,59%,14%)

Colore RGB

R: 220 G: 120 B: 90

Rango

Formazione litostratigrafica

Uso

Unità in uso.

Status

termine informale

Discussione del statuto

Nomenclatura

Deutsch

Schönbühl-Formation

Français

Formation de Schönbühl

Italiano

Formazione di Schönbühl

English

Schönbühl Formation

Origine del nome

Schönbühl = Schönbüel (GL), Plateau zwischen Spitzmeilen und Rotgandwand

Varianti storiche

Schönbühl-Schiefer(n) (Brunnschweiler ---, Trümpy ---, Dollfuss ---, Fisch 1961, Rutsch et al. 1966), Schönbühlschiefer (Bächtiger 1963, Ryf 1964), Schistes de Schönbühl (Huber 1964), Schönbüel Formation (Letsch et al. 2015), Schönbühl-Formation (Löpfe et al. 2018)

Descrizione

Descrizione

rote Tonsteine, einige Sst- & Kalkbänke, zuoberst Quarzitbänke / höchste Horizont des Verrucano: blutroten Schieferserie / Phylliten

Gerarchia e successione

Unità di rango inferiore

• «Schönbühl-Quarzit»

Unità sovrastante

• Kapfen-Formation

Unità sottostante

• Fuggstock-Member

Limite inferiore

locally marked angular unconformity (Ryf 1965)

Età

Geomorfologia

• Lopingiano (= Tardo Permiano)

Osservazioni sul tetto

Trias [Brunnschweiler], Lias [Trümpy] oder sogar Dogger [Dollfuss]

Età alla base

• Cisuraliano (= Primo Permiano)

Osservazioni sulla base

Frühes oder Mittleres Perm ?

Geografia

Estensione geografica

von Fulengipfel nach Norden und Westen

Referenze

Definizione

Fisch W. P. (1961) : Der Verrucano auf der Nordost-Seite des Sernftales (Kt. Glarus) Mitteilungen der Naturforschenden Gesellschaft des Kantons Glarus 11, 88 S.

Revisione

Letsch Dominik, Winkler Wilfried, von Quadt Albrecht, Gallhofer Daniela (2015) : The volcano-sedimentary evolution of a post-variscan intramontane basin in the Swiss Alps (Glarus Verrucano) as revealed by zircon U-Pb age dating and Hf isotope geochemistry. International Journal of Earth Sciences (Geologische Rundschau) 104, 123–145

p.133: In the upper Chrauchtal and Murgtal, the Verrucano ends with an intensely red, silty shale succession (playa deposits) with abundant green reduction spots and some intercalated coarser-grained layers (sandstones and Sernifites), the Schönbüel Formation (Fisch 1961). In the basal parts of the Schönbüel Formation north of the Murgsee, Ryf (1965) could observe a marked angular unconformity in

fine-grained Sernifites. The layers below the unconformity dip some 25° steeper than the layers above and the latter fill channels which are incised into the former (see the pictures provided by Ryf 1965). (...) At the type locality of the Schönbüel Formation (the Schönbüel plateau between the Spitzmeilen and the Rotgandwand) the uppermost part of this Formation, a few 10 m below the erosional base of the Triassic Mels Formation (Gisler et al. 2007), is interrupted by three very prominent, reddish-white, feldspar- and quartz-rich layers, each between 0.5 m and 4 m thick (see Fig. 8c, the so-called “Schönbüel quartzites” of the older literature) which were identified by Ryf (1965) as partly reworked rhyolitic tuff layers. Markus (1967) and Richter (1968) could follow these three tuff layers in the areas to the E and NE of the present study area (Flumserberge, Schilstal, and Guscha group) over an area of at least 150 km2.