Mären-Formation
Back to Eastern HelveticsRepresentation and status
- Color CMYK
- (0%,53%,71%,25%)
- Color RGB
- R: 190 G: 90 B: 55
- Rank
- lithostratigraphic Formation
- Validity
- Unit is in Use
- Status
- informal term
Nomenclature
- Deutsch
- Mären-Formation
- Français
- Formation de la Mären(egg)
- Italiano
- Formazione della Mären(egg)
- English
- Mären Formation
- Origin of the Name
-
Märenegg (GL) auf der E-Seite des Krauchtales
- Historical Variants
- Mären-Serie (Fisch 1961, Huber 1964, Ryf 1964, Rutsch et al. 1966), Mären Formation (Letsch et al. 2015), Mären-Formation (Löpfe et al. 2018, Hantke et al. 2019)
- Nomenclatorial Remarks
- Série intermédiaire (Huber 1964), Bunte Serie + Sunneberg-Serie (Schielly 1964)
Description
- Description
- heterogene Schiefer- und Phyllitserie, mit basischen Lavenbänke und saure "quarzporphyroide" Einschaltungen (Südseite des Gulderstockes) [Fisch 1961 S.9]
- Thickness
- ca. 60 m im Osten
Hierarchy and sequence
- Subordinate units
- Units at roof
Age
- Age at top
-
- Cisuralian (= Early Permian)
- Age at base
-
- Cisuralian (= Early Permian)
- Dating Method
- Radiometrische Datierungen (U/Pb Zirkon ; Letsch et al. 2015): 285 Ma.
Geography
- Geographical extent
- vom Foolstock (Gipfelkappe) bis ins Widersteinerloch
References
- Definition
- (1961) : Der Verrucano auf der Nordost-Seite des Sernftales (Kt. Glarus) Mitteilungen der Naturforschenden Gesellschaft des Kantons Glarus 11, 88 S.
- Definition
-
(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.132: The Üblital Formation grades upward into the Mären Formation (Fisch 1961) which is dominated by fine grain sizes and the abundant occurrence of volcanic rocks and the peculiar Sonnenberg horizons. This Formation can be divided into a lower part without any volcanics (the Foostock Member, Fisch 1961) and an upper part with abundant volcanics (the Grisch Member, Wyssling 1950). The Mären Formation is characterized by sandy and silty pelitic rocks of reddish, purple, or green colour. Intense red colours as in the Schönbüel Formation (see below) lack. In the Grisch member, volcanic rocks and darker sediments of the Sonnenberg type may dominate the section, especially in the Freiberg area (Amstutz 1954). In the Murgtal area, the Mären Formation passes laterally into a sandy marginal facies dominated by sandstones and fine-grained breccias (Ryf 1965).
-
Grisch-Member
- Name Origin
-
Piz Grisch = Crap Ner = Laaxer Stöckli (GR), SW vom Segnas-Pass
- Rank
- lithostratigraphic Member (Subformation)
- Status
- informal term
- In short
-
Bunte Tonschiefer mit Lagen und Linsen von rotgelb anwitterndem Karbonat.
- Age
- Cisuralian (= Early Permian)
-
Hahnenstock-Keratophyr
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- In short
-
Meist tektonisch verschieferte, detritisch aufbereitete, trachytische Vulkanitabfolge.
- Age
- Cisuralian (= Early Permian)
-
Sonnenberg-Horizonte
- Name Origin
-
Sonnenberg = Sunnenberg (GL) am Kärpf
- Rank
- petrographic facies
- Status
- unknown status
- In short
- Dunkelgrauer, pyrit- und glimmer-führender Arkosesandstein, dunkler Süsswasserkalk, dunkle Pelit und Konglomeratlagen des «Glarner Verrucano».
- Age
- Cisuralian (= Early Permian)
-
Chammseeli-Konglomerat
- Rank
- lithostratigraphic Bed
- Status
- unknown status
-
Foostock-Member
- Name Origin
- Rank
- lithostratigraphic Member (Subformation)
- Status
- informal term
- In short
- Violetter bis grüner Phyllit. Ohne vulkanischen Einlagerungen.
- Age
- Cisuralian (= Early Permian)