Ahornen-Member

Retour à Helvétique central

Représentation et statut

Couleur CMYK
(0%,8%,51%,4%)
Couleur RGB
R: 245 G: 225 B: 120
Rang
Membre lithostratigraphique (Sous-formation)
Usage
Ce terme est en usage.
Status
terme formel valide

Nomenclature

Deutsch
Ahornen-Member
Français
Membre du Ahornen
Italiano
Membro del Ahornen
English
Ahornen Member
Variantes historiques
Ahornenschichten (Frey 1965), Wildflysch = Ahornen-Schichten (Hantke et al. 2011), Ahornen Member (Menkveld-Gfeller et al. 2016)

Description

Description
Das Ahornen-Member ist charakterisiert durch das Auftreten von grünen, vulkanischen Gesteinsfragmenten im Sandstein. Die Basis des Members besteht häufig aus plattigem Mergelstein, welcher bereits zur Stad-Formation gehört.
Épaisseur
Meist 6-10 m (Frey 1965).

Composants

Lithologies
Sandstein enthält grüne, vulkanische Gesteinsfragmente.

Âge

Âge au sommet
  • Priabonien

Note sur le sommet
?
Âge à la base
  • Priabonien

Note sur la base
?

Géographie

Extension géographique
Zentral- und Ostschweiz (Reusstal bis Linthtal).
Localité-type
  • Ahornenrus = Malorrus (GL)
    Particularités du site
    • typische Fazies
    Accessibilité du site
    • Grat
    Coordonnées
    • (2716100 / 1192700)
    Note
    • Styger 1961 (Profil Bodenbach), Frey 1965

Paléogéographie et tectonique

  • Tertiaire
Termes génériques
Type de protolithe
  • sédimentaire
Métamorphisme
non métamorphique

Références

Révision
Menkveld-Gfeller Ursula, Kempf Oliver, Funk Hanspeter (2016) : Lithostratigraphic units of the Helvetic Palaeogene: review, new definition, new classification. Swiss J. Geosc. 109/2, 171-199

p.188: The Ahornen Member was first described by Frey (1965; ‘‘Ahornen-Schichten’’) at its type locality Ahornenrus (today Malorrus) (2716.100/1192.700). For further descriptions see Styger (1961; Bodenbach section). Lithology: The Ahornen Member that occurs at different locations of Central and Eastern Switzerland is characterized by the appearance of greenish volcanic rock fragments in the sandstone. This is in contrast to the remaining members of the Muot-da-Rubi Formation, in which such fragments are absent. The base here often consists of slaty marlstone, which already belongs to the Stad Formation. Overyling strata: Taveyannaz Formation, tectonic boundary; underlying strata: Stad Formation, Malor Member (exceptionally). Biostratiography: ?Priabonian. Current geographical extent: Central and Eastern Switzerland: Reuss valley to Linth valley. Tectonic units: Central and Eastern Switzerland: Lower Helvetic.

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