Homberg-Member

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Representation and status

Index
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CMYK Color
-
RGB color
R: 235 G: 205 B: 195
Rank
lithostratigraphic unit
Validity
Unit is in Use
Status
proposal
SCS note
-
SCS date
-
Comment
-

Nomenclature

German
Homberg-Member
French
Membre de Homberg
Italian
Membro di Homberg
English
Homberg Member
Origin of the Name

Homberg bei Thun (BE)

Historical Variants
Mergel-Sandsteinzone an der Basis der Honegg-Nagelfluh (Haus 1937, Habicht 1987), Homberg Schichten (Schlunegger 1991 und 1995), Homberg Beds (Schlunegger et al. 1993).
Nomenclatorial Remarks
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Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description

Abfolge schlecht zementierter, karbonatarmer, feldspatreicher Sandsteine, Siltsteine und Tonsteine an der Basis der Blueme-Schuppe.

Schwermineralien: Granat und Apatit dominieren, reich an Turmalin, untergeordnet Staurolith, Epidot, Zirkon.

Geomorphology
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Thickness
Ca. 500 m (Schlunegger et al. 1993).

Components

Lithological content
  • siltstone
  • sandstone (psammite, arenite) : grains 1/16 mm - 2 mm
  • mudstone : Tonstein/Mergelstein der Molasse
  • claystone : karbonatfrei
Mineral content
  • tourmaline
  • garnet
  • epidote
+ Apatit und Zirkon
Fossil content
-

Hierarchy and succession

Superordinate unit
Subordinate units
Units at roof
    -
Units at floor
Lateral equivalents
Upper boundary
-
Lower boundary
Tektonischer Kontakt (Steffisburg-Schuppe).
Stratigraphic discussion
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Age

Age at top
early Chattian
Note about top
-
Age at base
early Chattian
Note about base
Oensingen (MP26)
Dating method
Kleinsäuger (Schlunegger et al. 1993)

Geography

Geographical extent
-
Type area
Type locality
-
Type profile
-
Reference profiles
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Point of interest
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Paleogeography and tectonic

Paleogeography
North Alpine Foreland Basin,
Kind of protolith
  • sedimentary
Conditions of formation
-
Sequence
-
Tectonic Unit (resp. main category)
Subalpine Molasse
Metamorphism
-
Metamorphic facies
-
Note on metamorphism
-

References

Definition
Schlunegger Fritz, Matter Albert, Mang, Maria A. (1993): Alluvial fan sedimentation and structure of the southern Molasse Basin margin, Lake Thun area, Switzerland. , Eclog. Geol. Helv. 86/3, 717-750

The Homberg Beds measuring 500 m form a relatively fine grained unit made up of channel sandstones with epsilon cross bedding and associated crevasse splay, levee and floodbasin deposits.

Revision
Schlunegger Fritz (1995): Magnetostratigraphie und fazielle Entwicklung der Unteren Süsswassermolasse zwischen Aare und Limmat. , Inauguraldissertation Universität Bern, 185 S.
Important publications
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Material and varia

Applications
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