Gruhalde-Member

Representation and status

Color CMYK

(0%,24%,35%,4%)

Color RGB

R: 245 G: 185 B: 160

Rank

lithostratigraphic Member (Subformation)

Validity

Unit is in Use

Status

valid formal name

Status discussion

Nomenclature

Deutsch

Gruhalde-Member

Français

Membre de la Gruhalde

Italiano

Membro della Gruhalde

English

Gruhalde Member

Origin of the Name

Tongrube Gruhalde, Frick (AG) ; siehe auch lokales Sauriermuseum

Historical Variants

Keuper supérieur (Caire 1970), Gruhalde Member (Jordan et al. 2016), Plateosaurus bonebeds (Scheyer et al. 2022)

Nomenclatorial Remarks

Obere Bunte Mergel + Zanclodon-Mergel, Knollenmergel

Description

Description

Heterogene Abfolge von bunten bis gräulichen dolomitischen Mergeln mit dolomitschen Zwischenlagen, meist Dolocrete, aber auch oolithische, flachmarine Dolomite und Interklasten von grobem Sand, in den meisten Fällen sandige Dolomite bis dolomitische Sandsteine (Jordan et al. 2016).

Thickness

3 - 20 m (Jordan et al. 2016)

Components

• reptiles

Plateosaurus

Hierarchy and sequence

Superordinate unit

• Klettgau-Formation

Subordinate units

• «Zanclodon-Mergel»
• «Obere Bunte Mergel»

Units at roof

• Belchen-Member

Units at floor

• Gansingen-Member

Upper boundary

Einsetzen von bunten Mergeln über sandigen Dolomiten.

Lower boundary

Stratigraphische Lücke (altkimmerische Diskordanz)

Age

Age at top

• Norian

Age at base

• Norian

Geography

Geographical extent

Nordschweiz, fehlt ganz im Westen.

Type locality

• Grube Gruhalden bei Frick (AG)
  Coordinates
  • (2642960 / 1261963)
  Note
  • Beschreibung in Gsell 1968 und Meyer & Furrer 1995

Palaenography and tectonic

• Triassic of the Jura Mountains

Paleogeography

Northern Tethyan Carbonate Platform :
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP)

Tectonic unit (resp. main category)

• Jura :
  Juragebirge

Kind of protolith

• sedimentary

Conditions of formation

Fluvio-lakustrin, Saurierfunde.

Metamorphism

non metamorphic

References

Definition

Jordan Peter, Pietsch Johannes S., Bläsi Hansruedi, Furrer Heinz, Kündig Nicole, Looser Nathan, Wetzel Andreas, Deplazes Gaudenz (2016) : The middle to late Triassic Bänkerjoch and Klettgau formations of northern Switzerland. Swiss J. Geosc. 109/2, 257-284

"Heterogeneous succession of variegated to greyish dolomitic marl with dolomite interlayers, mostly dolocrete, but also oolitic shallow marine dolomites, and intercalations of coarse sand, in most cases sandy dolomite to dolomitic sandstone. Widespread, often channel-type erosion affected the succession."

Important Publications

Jordan Peter, Pietsch Johannes S., Bläsi Hansruedi, Furrer Heinz, Kündig Nicole, Looser Nathan, Wetzel Andreas, Deplazes Gaudenz (2016) : The middle to late Triassic Bänkerjoch and Klettgau formations of northern Switzerland. Swiss J. Geosc. 109/2, 257-284

Material and varia