Unterer Teil des Helvetischen Kieselkalkes (s.l.)
Back to Doldenhorn NappeRepresentation and status
- Color CMYK
- N/A
- Color RGB
- R: 125 G: 125 B: 125
- Rank
- lithostratigraphic unit
- Validity
- Unit is not in Use
- Status
- incorrect term (disused)
Nomenclature
- Deutsch
- Unterer Teil des Helvetischen Kieselkalkes (s.l.)
- Français
- Partie inférieure du Kieselkalk Helvétique (s.l.)
- English
- Lower part of the Helvetic Kieselkalk (s.l.)
- Historical Variants
-
Untere Kieselkalkgruppe, Unterer Kieselkalk (Staeger 1944, Schindler 1959, Spörli 1966, Mojon 1982), Lower Kieselkalk (Föllmi et al. 2007)
Description
- Thickness
- 2-100 m (Mojon 1982); bis 500 m (Föllmi et al. 2007
Hierarchy and sequence
Age
- Age at top
-
- Early Hauterivian
- Age at base
-
- Valanginian
- Dating Method
-
Ammoniten-Biostratigraphie der umrahmenden Einheiten (loryi-Zone und unterer Teil der nodosoplicatum-Zone (Föllmi et al. 2007)
Palaenography and tectonic
- Tectonic unit (resp. main category)
- Kind of protolith
-
- sedimentary
References
- Definition
-
2007) :
Unlocking paleo- environmental information from Early Cretaceous shelf sediments in the Helvetic Alps: stratigraphy is the key! Swiss J. Geosci. 100, 349-369
p.8: The lower Kieselkalk consists of an up to 500 m thick sandy, siliceous grain- to packstone dominated by crinoidal and bryozoan remains in proximal areas and by sponge spicules in distal areas. Sediments of this unit are typically heterozoan and rather coarse in proximal areas, whereas in distal areas fine-grained sediments dominate – especially at the base, where marls and/or micritic carbonates similar to the Diphyoides Formation prevail (Funk 1971; Felber and Wyssling 1979; Wyssling 1986; Kuhn 1996). The presence of channel structures and tempestite deposits is suggestive of a highly dynamic depositional environment in platform and platform slope areas. This is probably also indicated in the eastern, Vorarlberg part of the Helvetic zone, where sediments of the Helvetic Kieselkalk Formation are absent near the platform margin (Wyssling 1986).
The platform carbonate body of the lower Kieselkalk prograding on top of the Gemsmättli-Pygurus Complex probably represents a highstand systems tract, whereas in the outer shelf, the sediments correlated to this member may represent a more complete sequence.
The age of the lower Kieselkalk is well defined by the ages of the under- and overlying condensed and ammonite-rich beds and corresponds to the loryi and lower part of the nodosoplicatum zones.
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-
Echinodermenbrekzie des Unteren Kieselkalkes
- Rank
- lithostratigraphic unit
- Status
- incorrect name (though informally used)
- Valid term
- Helvetischer-Kieselkalk
- In short
- Spätige, meist mittel- bis dickgebankte Abfolge von braun bis ockerbraun anwitternden Kalken im Dach des «Unteren Kieselkalkes».
-
Gebankte Abteilung des Unteren Kieselkalkes
- Rank
- lithostratigraphic unit
- Status
- incorrect term (disused)
- In short
- Sehr eintönig, feinkörnige, regelmässig gebankte verkieselte Kalke (arenitischer Echinodermen-Spongien-Biomikrit mit «Mäuerchenkalkestruktur») im unteren Teil des Helvetischen Kieselkalkes.
- Age
- Early Hauterivian
-
«Basisschiefer» des unteren Helvetischen Kieselkalkes
- Rank
- lithostratigraphic unit
- Status
- incorrect name (though informally used)
- In short
-
Ausgeprägte mergelig-schieferige Abfolge im basalen Bereich des «Unteren Kieselkalkes».
- Age
- Valanginian
-
Untere Kieselkalkschiefer (s.s.)
- Rank
- lithostratigraphic unit
- Status
- incorrect name (though informally used)
- Valid term
- Helvetischer-Kieselkalk
- In short
- Die «Kieselkalkschiefer» machen den grössten Teil der mergelig-schiefrig ausgebildeten Basis der Helv. Kieselkalk-Fm. aus.
- Age
- Valanginian
-
Goldswiler-Platten
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- Valid term
- Helvetischer-Kieselkalk
- In short
-
Ton- und Quarz-reicherer, biodetritischer Teil des unteren Kieselkalk-Schiefers, mit Karbonatdissolution (Stylolithen).
-
«Ringgenberg-Schichten»
- Name Origin
- Rank
- lithostratigraphic unit
- Status
- local name (informal)
- Valid term
- Helvetischer-Kieselkalk
- In short
-
Dieser informelle Begriff bezeichnet grau-gelblicher, plattiger bis schiefriger, leicht spikulitischer Mikrit im Hangenden der Gemsmättli-Bank (Helvetischer-Kieselkalk).
- Age
- Valanginian