«Molasse de l'Helvétien»
Representation and status
- Color CMYK
- N/A
- Color RGB
- R: 125 G: 125 B: 125
- Rank
- lithostratigraphic Supergroup
- Validity
- Unit is not in Use
- Status
- obsolete term (disused)
Nomenclature
- Deutsch
- «Molasse des Helvétien
- Français
- «Molasse de l'Helvétien»
- Italiano
- «Helvetiano»
- English
- «Helvetian Molasse»
- Origin of the Name
-
Named after the disused Helvetian stage (Middle Miocene).
- Historical Variants
-
37e Etage = Helvétien = Grès coquillier = Muschelsandstein (Greppin 1866), Helvétien auct. (Rutsch 1933), Helvétien = oberer Teil der OMM (Gerber & Wanner 1984), Helvetian facies (Schoepfer & Berger 1989)
Description
- Description
-
Ancien terme à connotation chronostratigraphique désignant la Molasse marine supérieure (OMM).
Components
Fossil Content
- ostreids
grosse Austern (Ostrea gryphoides Schlotheim)
Hierarchy and sequence
- Units at floor
Age
- Age at top
-
- Langhian
- Age at base
-
- late Burdigalian
Palaenography and tectonic
-
- Upper Marine Molasse
- Tectonic unit (resp. main category)
- Kind of protolith
-
- sedimentary
- Metamorphism
- non metamorphic
References
- Definition
-
(1989) :
«Burdigalian» and «Helvetian» in Western Switzerland. Geol. Carpathica 40, 17–21
p.17: The upper part of the OMM, corresponding to the so-called "Helvetian facies", is represented by conglomerates, sandstones and marls laid down under fluvial, gravity, tidal and wave control. This series is characterised by the development of fan deltas (Schoepfer 1987) and interfan areas on the southern margin of the molassic foreland basin.