Banc du Col de la Plaine Morte

Torna a Morcles

Rappresentazione e statuto

Colore CMYK
(0%,37%,37%,4%)
Colore RGB
R: 245 G: 155 B: 155
Rango
Strato litostratigrafico
Uso
Unità in uso.
Status
termine locale (informale)
SCS nota
Nicht zu verwenden: unnötig da sehr lokal ; Ortsname schon für eine andere lithostratigraphische Einheit verwendet (Wildflysch de la Plaine Morte).
SCS data
18.10.2007
Discussione del statuto

Nomenclatura

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
Origine del nome

Col de la Plaine Morte (VS)

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

Descrizione

Potenza
max. 20 cm

Componenti

Fossili
  • ammoniti
Deshayesites, Aconeceras

Gerarchia e successione

Unità di rango superiore

Età

Geomorfologia
  • Primo Aptiano
Osservazioni sul tetto
Untere Abschnitt der furcata-Zone
Età alla base
  • Primo Aptiano
Osservazioni sulla base
Obere Abschnitt der deshayesi-Zone

Geografia

Estensione geografica
Nur lokal im Rawilgebiet.
Regione-tipo
Rawilgebiet (VS/BE)
Località-tipo

Paleogeografia e tettonica

Termini generici
Tipo di origine
  • sedimentaria

Referenze

Revisione
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. (...)
Pubblicazioni importanti
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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