Südelbach-Member

Back to Central Helvetics

Representation and status

Color CMYK
(0%,8%,51%,4%)
Color RGB
R: 245 G: 225 B: 120
Rank
lithostratigraphic Member (Subformation)
Validity
Unit is in Use
Status
valid formal name

Nomenclature

Deutsch
Südelbach-Member
Français
Membre du Südelbach
Italiano
Membro del Südelbach
English
Südelbach Member
Origin of the Name

Südelbach / Südelgraben (LU), W Sörenberg

Historical Variants

Südelbach-Serie (Soder 1949, Gigon 1952, Hänni 1999), Südelbachserie (Rutsch et al. 1966), Südhelvetischer Flysch zwischen Engelberger Tal und Thuner See (Typus Südelbach-Serie) (Bayer 1982), Südelbach Member (Menkveld-Gfeller et al. 2016)

Nomenclatorial Remarks

sog. Ruhiger Obereocaenflysch, Flysch der Basalen Schuppe (Gigon 1952) ; siehe auch Eckert 1963

Description

Description

Das Südelbach-Member besteht unten aus Mergelstein, welcher nach oben hin in einen siltigen Kalk mit gradierten, klastischen Bänken übergeht. Gröbere polymikte Brekzien und Corallinaceen-Kalke treten auch vor.

Thickness
20-200 m (Bayer et al. 1982) ; über 1000 m an der Typlokalität (Soder 1949 ; jedoch mit tektonische Repetition).

Hierarchy and sequence

Upper boundary

Erosionsfläche

Lower boundary

Stad-Formation

Age

Age at top
  • Priabonian
Age at base
  • Priabonian

Geography

Geographical extent
Zentralschweiz zwischen Thunersee und Engelberger Tal (Habkerntal, Sörenberg).
Type locality
  • Südelgraben (LU), Sörenberg
    Site particularities
    • typische Fazies
    Site accessibility
    • Bachprofil
    Coordinates
    • (2643000 / 1186000)
    Note
    • Soder 1949, Menkveld-Gfeller et al. 2016

Palaenography and tectonic

  • Flyschs
  • Paleogene of the Helvetics
Paleogeography
South Helvetic Domain
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Metamorphism
non metamorphic

References

Definition
Menkveld-Gfeller Ursula, Kempf Oliver, Funk Hanspeter (2016) : Lithostratigraphic units of the Helvetic Palaeogene: review, new definition, new classification. Swiss J. Geosc. 109/2, 171-199

p.189: The Südelbach Member was described by Soder (1949; ‘‘Südelbach-Serie’’) at its type locality Südelgraben near Sörenberg (Canton Lucerne) (2643.000/1186.000). For further descriptions see Gigon (1952; Basale Flysch-Schuppe) and Eckert (1963).

Lithology: In part (primarily in the lower part) marlstone, but rapidly changing to silty marlstone in which scattered clastic graded beds appear. Equally, coarser grained polygenic breccia beds occur, as well as Corallinacean-rich limestone beds. The sequence is bounded by erosion towards the top. Underlying strata: Stad Formation (possibly tectonic boundary). Biostratigraphy: Priabonian, Larger foraminifera. Current geographical extent: Central Switzerland: Sörenberg, Habkern valley. Tectonic unit: Central Switzerland: Drusberg nappe.
Back to top