Grellingen-Member

Torna a Alto Reno meridionale

Rappresentazione e statuto

Colore CMYK
(0%,5%,3%,25%)
Colore RGB
R: 190 G: 180 B: 185
Rango
Membro litostratigrafico (Sotto-formazione)
Uso
Unità in uso.
Status
termine formale valido
Discussione del statuto

Nomenclatura

Deutsch
Grellingen-Member
Français
Membre de Grellingen
Italiano
Membro di Grellingen
English
Grellingen Member
Origine del nome

Grellingen (BL)

Varianti storiche
Grellingen Member (Gygi 2000b, Gygi 2000c)

Descrizione

Descrizione
Massige, gut gebankte, weisse Kalksteine im unteren Teil der St-Ursanne-Formation mit hermatypen Korallen, Rotalgen, Bryozoen und anderen Fossilien (Biostrom).
Geomorfologia
Kliffbildend
Potenza
30-40 m

Componenti

Fossili
  • coralli
  • alghe
  • briozoari

Gerarchia e successione

Unità di rango superiore
Limite superiore
oolithisches Tiergarten-Mb. bzw. kreidiges poröses Buix-Mb.
Limite inferiore
mergeliges Liesberg-Mb.

Età

Geomorfologia
  • Oxfordiano medio
Età alla base
  • Oxfordiano medio
Metodo di datazione
Datierung der Umrahmensgesteine mit Ammoniten (Sornetan- und Buix-Mb.).

Geografia

Estensione geografica
Zentraler Schweizer Jura.
Regione-tipo
Kantone Baselland, Solothurn und Bern
Sezione-tipo
  • Eigenhollen (BL)
    Caratteristiche del sito
    • typische Fazies
    Agibilità del sito
    • Bachprofil
    Coordinate
    • (2613000 / 1253700)
    Nota
    • Wasserfall SE Grellingen (Gygi 2000c)

Paleogeografia e tettonica

  • Malm (Jura)
Paleogeografia
Northern Tethyan Carbonate Platform (Jura > Helv.) :
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP)
Termini generici
Tipo di origine
  • sedimentaria
Condizioni di formazione
"Rauracien"
Metamorfismo
non metamorfo

Referenze

Definizione
Gygi R. A. (2000) : Integrated stratigraphy of the Oxfordian and Kimmeridgian (Late Jurassic) in northern Switzerland and adjacent southern Germany. Denkschriften der Schweizerischen Akademie der Naturwissenschaften 104, 152 S.

p.55
Revisione
Gygi R. A. (2000) : Annotated index of lithostratigraphic units currently used in the Upper Jurassic of northern Switzerland. Eclogae geol. Helv. 93/1, 125-146

p.131: Grellingen Member (Gygi 2000b) ; Member of the St-Ursanne Formation The Grellingen Member was named by Gygi (2000b. p. 55) after the village of Grellingen. Canton Baselland. LK 1067 Arlesheim. Gygi did not indicate a type locality. The best, easily accessible natural outcrop is along the footpath that circumvents the small waterfall of an unnamed creek above Eigenhollen at coordinates 613.000/253.700 on the territory of the village of Duggingen. Canton Baselland. LK 1087 Passwang. The Grellingen Member there forms a vertical cliff with an overhang at the base. This is proposed to be the type locality. The Grellingen Member is normally a massive limestone forming cliffs and has a biomicritic or bioarenitic matrix with hermatypic corals. It is a coral biostrome. Coral bioherms are uncommon, but they do occur (Gygi 20(X)b). The average thickness of the member is about 30 m. The lower boundary with the marly Liesberg Member is at many localities transitional. The upper boundary with the oolitic Tiergarten Member or the porous, chalk-like Buix Member, respectively, is well-defined. No ammonites have yet been found in the Grellingen Member. Ammonites of the Antecedens Subchron occur below in the Sornetan Member (Duong 1974. Pl. 3. Fig. 1. refigured by Gygi 1995. Fig. 25) and above in the Buix Member (Gygi 1995. Fig. 14). The age of the Grellingen Member is thus a fraction of the Antecedens Subchron. The Grellingen Member forms the lower part of the St-Ursanne Formation everywhere in northwestern Switzerland where the formation occurs, except for a relatively narrow strip where the lower St-Ursanne Formation is oolitic/oncolitic (Delémont Member). The correlation of the Grellingen Member can be read from figure 1.

Materiale e vario

Immagini
Grellingen_typlok
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