Tscharren-Formation

Representation and status

Index

hT

Color CMYK

(11%,0%,22%,29%)

Color RGB

R: 160 G: 180 B: 140

Rank

lithostratigraphic Formation

Validity

Unit is in Use

Status

informal term

Nomenclature

Deutsch

Tscharren-Formation

Français

Formation du Tscharren

Italiano

Formazione del Tscharren

English

Tscharren Formation

Origin of the Name

Tscharren (UR)

Historical Variants

Tscharren-Formation (Schenker 1987, Gisler 2018), Upper Paleozoic Sediments of Tscharren (Franks 1968), Tscharren-Gruppe (Guntli et al. 2016), Tscharren Formation (Berger et al. 2017)

Hierarchy and sequence

Subordinate units

• «Tuffaceous Member»
• «Ignimbritic Member»
• Rinderbiel-Mikrogranit

Age

Age at top

• Late Pennsylvanian

Age at base

• Late Pennsylvanian

Dating Method

303 +/-4 Ma (Schaltegger & Corfu 1995)

Geography

Type profile

• southern slopes of the upper part of the ridge of Tscharren (2488 m) on the south side of the Maderanertal
  

Palaenography and tectonic

• Permo-Carboniferous

Paleogeography

European continental plate

Tectonic unit (resp. main category)

• Aar

References

Definition

Berger Alfons, Mercolli Ivan, Herwegh Marco, Gnos Edwin (2017) : Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129

p.43: The Tscharren Formation, outcropping mainly in the Etzlital and Maderanertal, is in all aspects extremely similar to the Diechtergletscher Formation (FRANKS 1968 a, b, SCHENKER 1986, OBERHÄNSLI et al.1988). The rhyolitic tuff of the volcanic sequence alternates with volcaniclastic and clastic rocks (Fig.6) and was dated at 303±4 Ma (SCHALTEGGER & CORFU 1995).