Liedertswil-Member

Rappresentazione e statuto

Colore CMYK

(0%,35%,71%,4%)

Colore RGB

R: 245 G: 160 B: 70

Rango

Membro litostratigrafico (Sotto-formazione)

Uso

Unità in uso.

Status

termine formale valido

Discussione del statuto

Nomenclatura

Deutsch

Liedertswil-Member

Français

Membre de Liedertswil

Italiano

Membro di Liedertswil

English

Liedertswil Member

Origine del nome

Liedertswil (BL)

Varianti storiche

Plattenkalk, Nodosus-Kalk, Liedertswil Member (Pietsch et al. 2016)

Descrizione

Descrizione

Grauer, plattiger bis gebankter, mikritischer Kalk (ehem. «Plattenkalk» oder «Nodosus-Kalk») mit Dolomitschlieren und -lagen. Das Liedertswil-Member besteht im unteren Teil aus Kalken reich an schaligem Detritus und makrofossilarmen Mud- und Wackestones in oberen Teil.

Potenza

25 - 35 m (Fischer et al. 1971) ; von 1.5 m in der Bohrung Weiach bis max. 25 m (Pietsch et al. 2016)

Gerarchia e successione

Unità di rango superiore

• Schinznach-Formation

Unità di rango inferiore

• Eptingen-Bank
• Dünnlenberg-Bank

Unità sovrastante

• Stamberg-Member

Unità sottostante

• Kienberg-Member

Limite superiore

Stamberg-Member

Limite inferiore

Kienberg-Member

Età

Geomorfologia

• Ladinico iniziale

Età alla base

• Anisico tardo

Metodo di datazione

Compressus- und Evolutus-Zone (Pietsch et al. 2016)

Geografia

Estensione geografica

Nordschweizer Jura.

Regione-tipo

Östlicher Faltenjura

Località-tipo

• Dünnlenberg (BL), südlich Liedertswil
  Caratteristiche del sito
  • Obergrenze
  • Untergrenze
  • typische Fazies
  Agibilità del sito
  • Grat
  Coordinate
  • (2620930 / 1248530)
  Nota
  • Merki 1961, Herold 1992, Pietsch et al. 2016 Fig.11

Sezione-tipo

• Dünnlenberg (BL), südlich Liedertswil
  Caratteristiche del sito
  • Obergrenze
  • Untergrenze
  • typische Fazies
  Coordinate
  • (2620930 / 1248530)
  Nota
  • Merki 1961, Herold 1992, Pietsch et al. 2016 Fig.11

Paleogeografia e tettonica

• Trias (Jura)

Paleogeografia

Northern Tethyan Carbonate Platform (Jura > Helv.) :
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP)

Termini generici

• Jura :
  Juragebirge

Tipo di origine

• sedimentaria

Condizioni di formazione

The Liedertswil Member documents the highstand and the first phase of regression. In Northern Switzerland and adjacent southern Germany, ceratite ammonite findings are restricted to the Dünnleberg Bed proper and some overlying horizons (Pietsch et al. 2016) at the base of the member.

Metamorfismo

non metamorfo

Referenze

Definizione

Pietsch Johannes S., Wetzel Andreas, Jordan Peter (2016) : A new lithostratigraphic scheme for the Schinznach Formation (upper part of the Muschelkalk Group of northern Switzerland). Swiss J. Geosc. 109/2, 285-307

The Liedertswil Member consists of limestones rich in shell detritus in the lower part and macrofossil-poor mud- and wackestones in the upper part. As discussed above, crinoid detritus may occur in some strata of the lower part. In most sections the Dünnlenberg Bed lies little above the base of the Liedertswil Member. Above the Dünnlenberg Bed other marl layers may occur. Locally ceratites can be found in these layers (see above; Braun 1920; Merki 1961). Strata above and below the marl layers may contain glauconite (Merki 1961; Herold 1992; Brüderlin 1969). Especially the upper part of the Liedertswil Member is often dolomitised. In some regions the dolomitised Liedertswil Member contains chert nodules (e.g. Braun 1920; Merki 1961). Within the lower parts often bedding planes and burrows are dolomitised similar to underlying members. The top of the Liedertswil Member is defined by the change from (dolomitic) limestone with single dolomitic strata to a both laterally continuous and pure dolomite. Due to the diagenetic nature of the upper boundary of the Liedertswil Member, the level of the boundary varies within the Schinznach Formation. It is therefore possible that the normally overlying Stamberg Member directly rests on the Kienberg Member, if dolomitisation is used as classification criterion and if dolomitisation affected the uppermost strata rich in crinoid detritus. In that case the Liedertswil Member is not developed as such. The oolitic interval around the boundary interval between the Liedertswil Member and the Stamberg Member is defined as Eptingen Bed. Depending on dolomitisation-depth it lies either in one or in both of these members.

Pubblicazioni importanti

Pietsch Johannes S., Wetzel Andreas, Jordan Peter (2016) : A new lithostratigraphic scheme for the Schinznach Formation (upper part of the Muschelkalk Group of northern Switzerland). Swiss J. Geosc. 109/2, 285-307