Saluver-Gruppe

Representation and status

Color CMYK

(0%,20%,55%,14%)

Color RGB

R: 220 G: 175 B: 100

Rank

lithostratigraphic Group

Validity

Unit is in Use

Status

unknown status

Status discussion

Nomenclature

Deutsch

Saluver-Gruppe

Français

Groupe du (Val) Saluver

Italiano

Gruppo della (Val) Saluver

English

Saluver Group

Origin of the Name

Piz Nair im oberen Val Saluver (GR)

Historical Variants

Saluvergesteine (Studer & Escher 1853/1869), Saluverschichten = Saluverserie = Saluverschiefer + Saluversandstein + Saluverbreccie (Cornelius 1923, Cornelius 1932), Saluvergesteine = Saluverschichten (Roesli 1945), Saluver Group (Furrer et al. 1985), Syn-rift sediments = Saluver Group (Manatschal & Nievergelt 1997)

Nomenclatorial Remarks

Doggerkalke und -breccien + Oxford-Argovien (Staub 1946)

Hierarchy and sequence

Subordinate units

• Saluver-Formation
• Bardella-Formation
• Salteras-Formation
• Salamùn-Brekzie
• Err-Brekzie

Units at roof

• Chanèls-Formation
• Blais-Formation

Units at floor

• Agnelli-Formation
• Allgäu-Formation

Lower boundary

Agnelli-Fm. (conformity) oder ältere sedimentäre bis kristalline Einheiten (unconformity) (Finger 1978, Manatschal & Nievergelt 1997)

Age

Age at top

• Callovian

Note about top

Einzelne Bänke ziehen noch bis im Blais-Radiolarit hin. Oder sogar jünger (Manatschal & Nivergelt 1997).

Age at base

• Toarcian

Dating Method

Kreide (Cornelius 1932) ; --- (Roesli 1944)

Geography

Geographical extent

Oberengadin

Palaenography and tectonic

• Dogger des Ostalpins

Paleogeography

Piemont Basin , Adriatic continental margin :

southern, passive continental margin / platform

Tectonic unit (resp. main category)

• Austroalpine

Kind of protolith

• sedimentary

Conditions of formation

Syn-rift sediments (Manatschal & Nievergelt 1997).

References

Definition

Manatschal Gianreto, Nievergelt Peter (1997) : A continent-ocean transition recorded in the Err and Platta nappes (Eastern Switzerland). Eclogae geol. Helv. 90/1, 3-27

p.8: Syn-rift sediments

Sedimentary breccias with a variable amount of matrix and intercalated hemipelagic background sediments, sandy limestones and shales conformably overlie the top of the Agnelli Formation or unconformably overlie the older sediments or metamorphic basement rocks (Finger 1978). The very local distribution and the strong variability in composition and texture, typical for syn-rift sediments, have led to different local names for these sediments, such as Saluver Formation (Finger 1978), Bardella Formation (Finger 1978), Salteras Series (Stöcklin 1949) and Salamun Breccia (Stöcklin 1949). In this study, the name "Saluver Group" (Furrer et al. 1985) is used for these sedimentary breccias and sandstones which are often particularly rich in crystalline basement clasts. Characteristic for the sedimentary breccias of the Saluver Group are a general up-section change from pure carbonate to carbonate/crystalline breccias (Stöcklin 1949) and the occurrence of one or more thinning- and fining-upward cycles (Finger 1978). The age of most of the breccias in the Lower Austroalpine units is badly constrained but the observation that these breccias stratigraphically overlie a hardground of Early Pliensbachien age (pers. com. Heinz Furrer) and are themselves overlain by radiolarian cherts of the upper Middle to Upper Jurassic Radiolarite Formation (Baumgartner 1987) makes a Middle Jurassic age for them most likely. The fact that in some places younger strata, sometimes even Lower Cretaceous Argille a Palombini, onlap the breccias and appear to interfinger with them (e.g. Fuorcla Mulix. see below) suggests that some of the breccias might also be younger.