Mürren-Brekzie
Back to Drusberg NappeRepresentation and status
- Index
- e6b
- Color CMYK
- (0%,18%,63%,0%)
- Color RGB
- R: 255 G: 210 B: 95
- Rank
- lithostratigraphic Bed
- Validity
- Unit is in Use
- Status
- informal term
Nomenclature
- Deutsch
- Mürren-Brekzie
- Français
- Brèche de Mürren
- Italiano
- Breccia di Mürren
- English
- Mürren Breccia
- Origin of the Name
- Historical Variants
- calcaire nummulitique de Mürren (Boussac 1912), Mürrenbrekzie, Kalkbreccie von Mürren mit Nummuliten (Stauffer 1920), Nummulitenkalkbreccie = Palacebreccie (Louis 1924), Mürrenbreccie (Günzler-Seiffert 1933, Herb et al. 1978), Mürren-Brekzie, Brèche de Mürren (Collet & Paréjas 1928 + 1931), Mürren-Breccie, Transgressionsbreccien und - konglomerate (Steffen 1981)
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.
Age
- Age at top
-
- late Eocene
- Age at base
-
- late Eocene
- Dating Method
- Biostratigraphie: Nummuliten
Geography
- Geographical extent
- Mürren ; ähnliche geschieferte Kalkbrekzie in der Aareschlucht (Arbenz & Müller in: GFS 1934).
Palaenography and tectonic
-
- Siderolithic
- Tectonic unit (resp. main category)
-
-
Zentrales Helvetikum
:
u.a. Berner Oberland
-
Zentrales Helvetikum
:
- Kind of protolith
-
- sedimentary
- Metamorphism
- non metamorphic
References
- Definition
-
(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.