Membre du Graitery

Back to Herznach-Member

Representation and status

Color CMYK
(0%,13%,31%,12%)
Color RGB
R: 225 G: 195 B: 155
Rank
lithostratigraphic Member (Subformation)
Validity
Unit is in Use

Nomenclature

Deutsch
Graitery-Member
Français
Membre du Graitery
Italiano
Membro del Graitery
English
Graitery Member
Origin of the Name

massif du Graitery (BE), S Moutier

Links

Possible confusion

Description

Description

Succession de marnes grises légèrement arénitiques avec quelques bancs de calcaire marneux. Présence de glauconie dans la partie supérieure. Quelques niveaux très fossilifères Avec céphalopodes, échinides, brachiopodes et spongiaires.

Thickness
9 à 12 m environ

Components

Mineral Content
  • quartz
  • glauconite
Fossil Content
  • ammonites
  • sponges
  • belemnites
  • brachiopods
  • echinoids
  • bivalves

Ammonites, Bélemnites, Echinides, Brachiopodes, Eponges calcaires et siliceuses, Bivalves.

Hierarchy and sequence

Superordinate unit
Upper boundary

Marnes glauconieuses, localement banc de calcaire marneux.

Lower boundary

Premières marnes gris cendré dépourvues d'oolithes ferrugineuses au-dessus du Mb. d'Herznach.

Age

Age at top
  • late Callovian
Note about top

Fin de la Lamberti-Zone

Age at base
  • middle Callovian
Note about base

Début de la Sous-Zone à Grossouvrei (Premiers Erymnoceras doliforme) à la localité-type, début de la Zone à Lamberti à Châtillon.

Dating Method

Ammonites.

Geography

Geographical extent
Region du Graitery, au Nord jusqu'à Châtillon.
Type area
Graitery (BE)
Type locality
Type profile

Palaenography and tectonic

  • Dogger of the Jura Mountains
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Metamorphism
non metamorphic

References

Definition
Hostettler Bernhard (2012) : New lithostratigraphic units for the Callovian stage in the central NW Swiss Jura Mountain. Swiss Geoscience Meeting, Abstract Volume 10 (Bern), 169–170

Graitery Member (previously Kellaway, Renggeri Tone)

The typlocality is near Combe d’Eschert, BE (597 250/233 650).

Lithologically it is a gray marl with some marly limestone beds. Except of the middle part this member is very fossiliferous (e.g., ammonites, echinids, sponges, brachiopods). In the upper part glauconite and phosphatized ammonites. The thickness at the typlocality is 9-12m.

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