Tristel Formation

Tristel Formation
Stratigraphic range: Barremian

Tristel Formation near type locality. Looking at Naafkopf from SW.
Type Geological formation
Unit of Rhenodanubic Group, Bündnerschiefer
Thickness 150 to 250 m.[1]
Location
Coordinates 47°03′39″N 9°36′25″E / 47.060767°N 9.607067°E / 47.060767; 9.607067Coordinates: 47°03′39″N 9°36′25″E / 47.060767°N 9.607067°E / 47.060767; 9.607067
Region Allgäu, Oberbayern, Tirol, Vorarlberg
Country Austria, Germany, Liechtenstein, Switzerland
Type section
Named for Mountain next to the Naafkopf
Named by Schwizer, B.
Year defined 1984

The Tristel Formation is a stratigraphic formation deposited between the upper Barremian and the lower Aptian (Lower Cretaceous). It consists of thickly banked limestones, marls and shales.[1] It is the lowest formation of the Bündnerschiefer and belongs to the Rhenodanubic Group.[2]

Outcrops can be found in the Engadin window, the Tauern window, the Rechnitz window, and many localities of the Penninic realm of the eastern and western Alps.[3]

The type locality is the area around the Naafkopf (47°03′39″N 9°36′25″E / 47.060767°N 9.607067°E / 47.060767; 9.607067) in the border region of Austria, Liechtenstein and Switzerland.[1]

The Tristel Formation can be correlated with the Klus Formation in Graubünden and the Couches de l’Aroley Formation in Savoie (France) and Valais (Switzerland).[4][5]

References

  1. 1 2 3 "Tristel-Formation". Lithostratigraphische Einheiten Deutschlands.
  2. Tricart, Pierre-Charles de Graciansky, David G. Roberts, Pierre (2010). The Western Alps, from rift to passive margin to orogenic belt : an integrated geoscience overview (1st ed.). Amsterdam: Elsevier. p. 158. ISBN 978-0444537249.
  3. "http://palstrat.uni-graz.at/Stratigraphische_Tabelle_von_Oesterreich_2004.pdf" (PDF). Retrieved 25 February 2013. External link in |title= (help)
  4. Loprieno, Andrea (2011). "The Valais units in Savoy (France): a key area for understanding the palaeogeography and the tectonic evolution of the Western Alps".
  5. Tricart, Pierre-Charles de Graciansky, David G. Roberts, Pierre (2010). The Western Alps, from rift to passive margin to orogenic belt : an integrated geoscience overview (1st ed.). Amsterdam: Elsevier. p. 153. ISBN 978-0444537249.
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