«Grenznerineen-Bank»

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Representation and status

Index
i7N
CMYK Color
siehe Reuchenette-Formation
RGB color
R: 145 G: 205 B: 215
Rank
lithostratigraphic Bed
Validity
Unit is in Use
Status
incorrect name (though informally used)
SCS note
-
SCS date
-
Comment
Plusieurs bancs à nérinées successifs sont parfois présents. Seul le dernier constitue le Grenznerineen-Bank. En l'absence de ce banc repère d'autres marqueurs sont utilisés pour tracer la limite supérieure de la Formation de Reuchenette (cf. Niveau à Cladocoropsis et Marnes à Virgula Supérieures).

Nomenclature

German
«Grenznerineen-Bank»
French
«Banc à Nérinées (du sommet)»
Italian
-
English
«Boundary Nerineans Bed»
Origin of the Name
Namensgebendes Fossil (Gastropoda): Nerinea spp. Diese Bank übertrifft die anderen in Zahl und Grösse der Individuen.
Historical Variants
Banc à Nérinées, Grenznerineenbank (Frey 1925), Nerineenbank, Nerinea Bed, banc à Nérinées = Grenz-Nerineenbank (Bourquin 1946), Banc à Nérinées (Dauwalder & Remane 1979)
Nomenclatorial Remarks
-

Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
-
Geomorphology
-
Thickness
1 à 1,8 m

Components

Lithological content
-
Mineral content
-
Fossil content
  • nerineans

Hierarchy and succession

Units at roof
Units at floor
Lateral equivalents
Upper boundary
-
Lower boundary
stellenweise unscharf
Stratigraphic discussion
niveau repère à la limite entre les Formations de Reuchenette et du Twannbach

Age

Age at top
Late Kimmeridgian
Note about top
Autissiodorensis/Beckeri-Zone
Age at base
Late Kimmeridgian
Note about base
Autissiodorensis/Beckeri-Zone
Dating method
Ammonitenbiostratigraphie (Meyer 1994)

Geography

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

Paleogeography and tectonic

Paleogeography
-
Kind of protolith
-
Conditions of formation
Environnement littoral.
Sequence
-
Tectonic Unit (resp. main category)
Jura
  • Southern Germany
  • Black Forest
Metamorphism
non metamorphic
Metamorphic facies
-
Note on metamorphism
-

References

Definition
Häfeli C. (1964): Zur Jura / Kreide-Grenze im Bielerseegebiet (Kt. Bern) , Bull. Ver. schweiz. Petroleum-Geol. u. -Ing. 31/ 80, 33- 38

"Die Grenznerineenbank von 1,0-1,8 m Mächtigkeit besitzt eine konstante Ausdehnung und stellt den einzigen kartierbaren Horizont im Bereich der Grenze zwischen Reuchenette- und Twannbachformation dar." [Häfeli 1964 S.33]

Revision
Rameil N. (2005): Carbonate sedimentology, sequence stratigraphy, and cyclostratigraphy of the Tithonian in the Swiss and French Jura Mountains: a high-resolution record of changes in sea level and climate , GeoFocus 13, 246

In the Jura neuchâtelois, the upper virgula Marls are missing. Therefore, FREI (1925) defined the so-called Grenznerineenbank to act as formation boundary (see also DAUWALDER & REMANE 1979). However, this can be problematic in some places. E.g., the Noirvaux section is located just at the southern rim of this area and thus the virgula Marls are absent (see Fig. 4.11). Yet, BLÄSI (1980) and KETTIGER (1981) did not find a Grenznerineenbank in Noirvaux, whereas MOUCHET (1995), based on KETTIGER (1981), defines the thick bed from 88.2-90.2 m (banc 37 in MOUCHET 1995) as Grenznerineenbank. Indeed, this bed contains some gastropods and also nerineans but not in a way that would distinguish it from other nerinean-bearing beds in the upper Reuchenette Formation.
Important publications
  • Dauwalder Pierre, Remane Jürgen (1979): Etude du Banc à Nérinées à la limite «Kimméridgien-Portlandien» dans le Jura Neuchâtelois méridional. , Paläont. Z. 53/3-4, 163-181

Material and varia

Applications
-
  • «Banc à Nérinées supérieur»

    Origin of the Name
    -
    Rank
    undefined
    Status
    -
    Valid name
    In Short
    -
    Age
    -
    Thickness
    -
    Geographical extent
    -
    Type area
    Chaumont (NE), au-dessu de Neuchâtel
    Comment
    -
  • «Banc intermédiaire»

    Origin of the Name
    -
    Rank
    undefined
    Status
    -
    Valid name
    In Short
    -
    Age
    -
    Thickness
    0,3 m
    Geographical extent
    -
    Type area
    -
    Comment
    -
  • «Banc à Nérinées inférieur»

    Origin of the Name
    -
    Rank
    undefined
    Status
    -
    Valid name
    In Short
    -
    Age
    -
    Thickness
    -
    Geographical extent
    -
    Type area
    -
    Comment
    -