Banc du Col de la Plaine Morte

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Darstellung und Status

Farbe CMYK
(0%,37%,37%,4%)
Farbe RGB
R: 245 G: 155 B: 155
Rang
lithostratigraphische Bank
Gebrauch
Element ist in Gebrauch
Status
lokaler Begriff (informell)
SKS-Notiz
Nicht zu verwenden: unnötig da sehr lokal ; Ortsname schon für eine andere lithostratigraphische Einheit verwendet (Wildflysch de la Plaine Morte).
SKS-Datum
18.10.2007
Diskussion des Status

Nomenklatur

Deutsch
Col-de-la-Plaine-Morte-Bank
Français
Banc du Col de la Plaine Morte
Italiano
Banco del Col de la Plaine Morte
English
Col de la Plaine Morte Bed
Herkunft des Namens

Col de la Plaine Morte (VS)

Historische Varianten
Plaine Morte Bed (Föllmi et al. 2006 et 2007, Föllmi & Gainon 2008, Föllmi 2009)

Beschreibung

Mächtigkeit
max. 20 cm

Komponenten

Fossilien
  • Ammoniten
Deshayesites, Aconeceras

Alter

Alter Top
  • Frühes Aptien

Bermerkungen zu Top
Untere Abschnitt der furcata-Zone
Alter Basis
  • Frühes Aptien

Bermerkungen zu Basis
Obere Abschnitt der deshayesi-Zone

Geografie

Geographische Verbreitung
Nur lokal im Rawilgebiet.
Typusregion
Rawilgebiet (VS/BE)
Typlokalität

Paläogeografie und Tektonik

Tektonische Einheit (bzw. Überbegriff)
Herkunftstyp
  • sedimentär

Referenzen

Neubearbeitung
Föllmi Karl B. (2009) : Neubenennungen lithostratigraphischer Einheiten in der helvetischen Kreide - Comment on the article by the Schweizerisches Komitee für Stratigraphie (SJG, Vol 102/2): What is in a stratigraphical name? Swiss J. Geosci. 102 (2009) 515–518

The Plaine-Morte Bed In the area of the Col de la Plaine Morte, the Plaine-Morte Bed embodies an approximately 20-cm thick nodular phosphatic layer within the Grünten Member, which is well distinguishable in the field. The Plaine-Morte Bed includes large clasts composed of crinoidal limestone of the lower Grünten Beds, which are peripherically phosphatized and small phosphatic nodules and particles. Sparse ammonites indicate the deshayesi and furcata ammonite zones (Föllmi & Gainon 2008). In this region, the Plaine-Morte Bed merges laterally with the higher Luitere Bed, and the intervening upper Grünten Beds disappear. The importance of this bed is that it helps us to explain the older ages shown in distal occurrences of the Luitere Bed in Allgäu and Vorarlberg, where ammonites are present from the deshayesi and furcata ammonite zones (besides younger ammonites indicating the early Late Aptian). These older ages can be explained by the Luitere Bed being merged with the Plaine-Morte Bed, in analogy of what is observed in the area of the Col de la Plaine Morte. This merging pattern is well comparable to the merging of different phosphorite beds into one singe bed higher up in the Garschella Formation. To this comes that with the Plaine-Morte Bed, the imprint of oceanic anoxic event 1a (the so-called “Selli event”) has been discovered on the northern Tethyan margin. (...)
Wichtige Publikationen
Föllmi Karl B., Gainon François (2008) : Demise of the northern Tethyan Urgonian carbonate platform and subsequent transition towards pelagic conditions: the sedimentary record of the Col de la Plaine Morte area, central Switzerland Sedimentary Geology 205, 142–159
Föllmi Karl B., Bodin Stephane, Godet Alexis, Linder Pascal, van de Schootbrugge B. (2007) : Unlocking paleo- environmental information from Early Cretaceous shelf sediments in the Helvetic Alps: stratigraphy is the key! Swiss J. Geosci. 100, 349-369
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