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
Homberg Schichten (Schlunegger 1991 und 1995), Homberg Beds (Schlunegger et al. 1993).
Nomenclatorial Remarks
-

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
-
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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