Calcaire à Cladocoropsis (mirabilis)
Representation and status
- Color CMYK
- cf. Formation de Reuchenette
- Color RGB
- R: 145 G: 205 B: 215
- Rank
- lithostratigraphic Bed
- Validity
- Unit is in Use
- Status
- incorrect name (though informally used)
Nomenclature
- Deutsch
- Cladocoropsis-Kalk
- Français
- Calcaire à Cladocoropsis (mirabilis)
- Italiano
- Calcare a Cladocoropsis
- English
- Cladocoropsis Limestone
- Origin of the Name
- Nom dérivé de l'éponge stromatopore fossile Cladocoropsis mirabilis Felix 1906.
- Historical Variants
- Cladocoropsiskalke = Bryozoenkalk = calcaire à Bryozoaires (Renz 1931)
Components
Fossil Content
- demosponges
Hierarchy and sequence
- Units at roof
- Upper boundary
- Marnes à Virgula supérieures / Formation du Twannbach
- Stratigraphic discussion
- niveau repère à la limite entre les Formations de Reuchenette et du Twannbach
Age
- Age at top
-
- Late Kimmeridgian
- Age at base
-
- Late Kimmeridgian
- Dating Method
- cf. Mouchet 1995, Colombié 2002
Geography
- Geographical extent
- Jura vaudois, neuchâtelois, bernois (Court, Tramelan) et soleurois (Oberdorf, Lommiswil).
Palaenography and tectonic
- Tectonic unit (resp. main category)
-
-
Jura
:
Juragebirge
-
Jura
:
- Kind of protolith
-
- sedimentary
- Metamorphism
- non metamorphic
References
- Definition
-
(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.