Mürren-Brekzie

Back to the list

Representation and status

Index
e6b
CMYK Color
-
RGB color
R: 255 G: 210 B: 95
Rank
lithostratigraphic unit
Validity
Unit is in Use
Status
informal term
SCS note
-
SCS date
-
Comment
-

Nomenclature

German
Mürren-Brekzie
French
Brèche de Mürren
Italian
Breccia della Mürren
English
Mürren Breccia
Origin of the Name

Mürren (BE)

Historical Variants
Mürrenbrekzie, Kalkbreccie von Mürren mit Nummuliten (Stauffer 1920), Mürrenbreccie (Günzler-Seiffert 1933, Herb et al. 1978), Mürren-Brekzie, Brèche de Mürren (Collet & Paréjas 1928 + 1931), Mürren-Breccie, Transgressionsbreccien und - konglomerate (Steffen 1981)
Nomenclatorial Remarks
-

Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
Kalkbrekzie mit Nummuliten an der Basis der Niederhorn-Formation. Der Brekziencharakter ist am besten auf angewitterten Oberflächen zu erkennen und die Komponenten der Brekzie sind häufig grau bis leicht rötlich/grünlich und maximal zentimetergross.
Geomorphology
-
Thickness
-

Components

Lithological content
  • breccia : conglomerate with angular components
Mineral content
-
Fossil content
-

Hierarchy and succession

Superordinate unit
Subordinate units
Units at roof
    -
Units at floor
Lateral equivalents
Upper boundary
-
Lower boundary
-
Stratigraphic discussion
-

Age

Age at top
late Eocene
Note about top
-
Age at base
late Eocene
Note about base
-
Dating method
Biostratigraphie: Nummuliten

Geography

Geographical extent
Mürren ; ähnliche geschieferte Kalkbrekzie in der Aareschlucht (Arbenz & Müller in: GFS 1934).
Type area
-
Type locality
-
Type profile
-
Reference profiles
-
Point of interest
-

Paleogeography and tectonic

Paleogeography
-
Kind of protolith
  • sedimentary
Conditions of formation
-
Sequence
-
Tectonic Unit (resp. main category)
Central Helvetics
Metamorphism
non metamorphic
Metamorphic facies
-
Note on metamorphism
-

References

Definition
-
Revision
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. 177: The crude iron-stained weathering of the Mürren breccia (‘‘Mürren-Brekzie’’) perhaps favours an interpretation as a deposit of the Siderolithic Group. The freshly cut limestone breccia, however, shows that the sandy cement contains Nummulites, and the components of the breccia are much smaller than usual in siderolithic rocks (Stauffer 1920). Therefore, the Mürren breccia belongs to the Palaeogene deposits and thus appears above the Siderolithic Group: the Mürren breccia is hence newly placed in the Hohgant Sandstone, a member of the Niederhorn Formation.

Important publications
-

Material and varia

Applications
-