Lavtina-Sandstein

Torna a zona di mélange di Habkern

Rappresentazione e statuto

Colore CMYK
(0%,0%,0%,100%)
Rango
Formazione litostratigrafica
Uso
Unità in uso.
Status
termine informale

Nomenclatura

Deutsch
Lavtina-Sandstein
Français
Grès de Lavtina
Italiano
Arenaria di Lavtina
English
Lavtina Sandstone
Origine del nome

Unterlavtina (SG)

Varianti storiche

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

Descrizione

Descrizione

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

Gerarchia e successione

Limite superiore

Tektonisches Kontakt.

Limite inferiore

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

Età

Geomorfologia
  • tardo Eocene
Età alla base
  • Eocene medio
Metodo di datazione

Foraminiferen.

Geografia

Estensione geografica
Ostschweiz (Weisstannental).
Località-tipo

Paleogeografia e tettonica

  • Flysch sud-elvetico
Paleogeografia
Distal NHS (S-Helv.)
Termini generici

Referenze

Definizione
Leupold W. (1942) : Das Alter des «Wildflyschs». Verh. Schweiz. natf. 122, 104-
Revisione
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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