Lavtina-Sandstein

Retour à zone de mélange de Habkern

Représentation et statut

Couleur CMYK
(0%,0%,0%,100%)
Rang
Formation lithostratigraphique
Usage
Ce terme est en usage.
Status
terme informel

Nomenclature

Deutsch
Lavtina-Sandstein
Français
Grès de Lavtina
Italiano
Arenaria di Lavtina
English
Lavtina Sandstone
Origine du nom

Unterlavtina (SG)

Variantes historiques

[non: Intermediärer Flysch =] Lavtinaflysch (Leupold 1942, Bisig 1957), Lavtina Sandstone (Menkveld et al. 2016), Lavtina-Flysch (Hantke et al. 2019)

Description

Description

"Wechsellagerung schwarzer, schwach siltiger, glimmerführender Schiefer und geringmächtiger Glimmerkalksandsteinbänke im Hangenden der Globigerinenschiefer des Blattengrat-Komplexes." (Frey 1965 S.86)

Hiérarchie et succession

Limite supérieure

Tektonisches Kontakt.

Limite inférieure

Stad-Fm. bzw. Muot-da-Rubi-Fm.

Âge

Âge au sommet
  • Eocène tardif
Âge à la base
  • Eocène moyen
Méthode de datation

Foraminiferen.

Géographie

Extension géographique
Ostschweiz (Weisstannental).
Localité-type

Paléogéographie et tectonique

  • Flysch sudhelvétique
Paléogéographie
domaine sud-helvétique
Termes génériques

Références

Définition
Leupold W. (1942) : Das Alter des «Wildflyschs». Verh. Schweiz. natf. 122, 104-
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.192: Leupold (1942) first described the Lavtina Sandstone (Formation; ‘‘Intermediärer Flysch’’, ‘‘Lavtinaflysch’’) from the type locality at Tristelrus/Unterlavtina (2746.200/1204.600). For further descriptions see Oberholzer (1933; as part of the ‘‘Wildflysch’’). Like the Blattengrat Sandstone, the Lavtina Sandstone is part of the so called ‘‘wrapped’’ flysch (‘‘eingewickelter Flysch’’, Arn. Heim 1911) representing the youngest and uppermost sediment succession in the Weisstannen valley (Blattengrat nappe). The Lavtina Sandstone is presumably an equivalent of the Blattengrat Sandstone and frequently forms individual tectonic slices.

Lithology: The Lavtina Sandstone comprises up to 0.5 m thick beds of grey (weathered yellow–brown) siliceous limestone and calcareous sandstone with black (weathered light-grey) slaty claystone layers in-between. ‘‘Fukoidenkalk’’ and ‘‘Fukoidenmergel’’ is frequently interbedded. The Lavtina Sandstone, like the Blattengrat Sandstone, passes gradually out of the Stad Formation (or Muot-da-Rubi Formation). Its thickness varies between ‘‘great thickness’’ and ‘‘in traces available’’ (cf. Leupold 1942). Overlying strata: tectonic boundary; underlying strata: Stad Formation (‘‘Fleckenmergel’’), Muot-da-Rubi Formation. Biostratigraphy: Middle Eocene–?Priabonian, foraminfera. Current geographical extent: Eastern Switzerland: Weisstannen valley. Tectonic units: Eastern Switzerland: Blattengrat nappe.
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