Calcaire à Cladocoropsis (mirabilis)

Rappresentazione e statuto

Colore CMYK

cf. Formation de Reuchenette

Colore RGB

R: 145 G: 205 B: 215

Rango

Strato litostratigrafico

Uso

Unità in uso.

Status

termine scorretto (informale)

Nomenclatura

Deutsch

Cladocoropsis-Kalk

Français

Calcaire à Cladocoropsis (mirabilis)

Italiano

Calcare a Cladocoropsis

English

Cladocoropsis Limestone

Origine del nome

Nom dérivé de l'éponge stromatopore fossile Cladocoropsis mirabilis Felix 1906.

Varianti storiche

Cladocoropsiskalke = Bryozoenkalk = calcaire à Bryozoaires (Renz 1931)

Componenti

• Demospongiae

Gerarchia e successione

Unità sovrastante

• Grenznerineen-Bank

Limite superiore

Marnes à Virgula supérieures / Formation du Twannbach

Osservazioni sulla stratigrafia

niveau repère à la limite entre les Formations de Reuchenette et du Twannbach

Età

Geomorfologia

• Kimmeridgiano tardo

Età alla base

• Kimmeridgiano tardo

Metodo di datazione

cf. Mouchet 1995, Colombié 2002

Geografia

Estensione geografica

Jura vaudois, neuchâtelois, bernois (Court, Tramelan) et soleurois (Oberdorf, Lommiswil).

Paleogeografia e tettonica

Termini generici

• Jura :
  Juragebirge

Tipo di origine

• sedimentaria

Metamorfismo

non metamorfo

Referenze

Revisione

Rameil N. (2005) : Carbonate sedimentology, sequence stratigraphy, and cyclostratigraphy of the Tithonian in the Swiss and French Jura Mountains: a high-resolution record of changes in sea level and climate GeoFocus 13, 246

The sponge Cladocoropsis mirabilis is an important regional marker for the Kimmeridgian/Tithonian boundary interval. MOUCHET (1995) described high abundances in the upper Reuchenette Formation of all measured sections and cores, just below the upper virgula Marls and the Grenznerineenbank. This is confirmed by own observations (see Fig. 7.1). However, it is not sure if the abundance of Cladocoropsis mirabilis in the upper Reuchenette Formation is really a biostratigraphic event or only a facies dependent effect.