Marne du Banné

Representation and status

Index

i7B

Color CMYK

cf. Formation de Reuchenette

Color RGB

R: 145 G: 205 B: 215

Rank

lithostratigraphic Member (Subformation)

Validity

Unit is in Use

Status

valid formal name

Status discussion

Nomenclature

Deutsch

Banné-Mergel

Français

Marne du Banné

Italiano

Marna del Banné

English

Banné Marl

Origin of the Name

Colline du Banné (JU), 1 km au sud Porrentruy ; voir aussi le site du musée Jurassica

Historical Variants

«Marnes à Ptérocères» auct., Marnes kimméridiennes = Marnes du Banné (Marcou 1848), Marnes du Banné (Marcou 1856, Thurmann & Etallon 1864, Bourquin 1946), Ptérocérien inférieur = couches du Banné (Rollier 1882), Couches du Banné (Disler 1941), Banné Member (Gygi 2000c)

Description

Description

marnes jaunâtres (cassure fraîche : grisâtre), très riches en fossiles (Ammonites, Bivalves, Gastéropodes, Brachiopodes)

Geomorphology

Forme souvent une ou plusieurs vires jaunâtres dans les parois rocheuses de la Fm. de Reuchenette.

Thickness

10 m en moyenne (5-11 m en Ajoie), max. 15 m dans la vallée du Doubs (Aufranc et al. 2016) ; seulement 0,6-0,8 m le long du Doubs (Bourquin 1946)

Components

• ammonites
• vertebrates
• gastropods
• nautiloids
• brachiopods
• bivalves

Hierarchy and sequence

Superordinate unit

• Formation de Reuchenette

Units at roof

• Membre de Courtedoux

Units at floor

• Membre de Vabenau

Age

Age at top

• Early Kimmeridgian

Note about top

Cymodoce-Z., Chatelaillonensis-Sz. = Zone à Acanthicum/Zone à Divisum

Age at base

• Early Kimmeridgian

Note about base

Cymodoce-Z., Chatelaillonensis-Sz. = Zone à Acanthicum/Zone à Divisum

Dating Method

Rares ammonites: Prorasenia sp. de la fin du Kimméridgien précoce (Gygi & Persoz 1986). Stratigraphie séquentielle et cyclostratigraphie: durée de sédimentation d'environ 0.2 Ma (Colombié 2002).

Geography

Geographical extent

Partie nord des cantons du Jura et de Neuchâtel.

Type area

Ajoie (JU), et plus particulièrement la région de Porrentruy

Type locality

• Le Banné (JU)
  Site particularities
  • typische Fazies
  • Fossilfundstelle
  Site accessibility
  • temporary exposure
  Coordinates
  • (2572215 / 1250610)
  Note
  • <p>Localité-type du Membre du Banné (Gygi 2000c, Comment et al. 2015): colline 1 km au sud de Porrentruy</p>

Reference profiles

• Courgenay - Alombre (JU)
  Site particularities
  • Obergrenze
  • typische Fazies
  Site accessibility
  • Steinbruch, Tongrube
  Coordinates
  • (2574750 / 1248150)
  Note
  • <p>Localité-type et coupe-type du Membre de Vabenau (Comment et al. 2011, Comment et al. 2015): carrière de Courgenay-Alombre (L'Alombre aux Vaches) à 500 m du lieu-dit Vabenau, 2.5 km SW Courgenay</p> <p>Coupe de référence du Membre du Banné (Gygi 2000c Profil RG341)</p>

Palaenography and tectonic

• Malm

Tectonic unit (resp. main category)

• Jura :
  Juragebirge

Kind of protolith

• sedimentary

Conditions of formation

Dépôts de lagon interne peu profond ou de chenal tidal large et peu profond.

Metamorphism

non metamorphic

References

Definition

Marcou Jules (1848) : Recherches géologiques sur le Jura salinois Mémoire de la Société géologique de France (2), 3/1, 151

p.104

Definition

Gygi R. A. (2000) : Annotated index of lithostratigraphic units currently used in the Upper Jurassic of northern Switzerland. Eclogae geol. Helv. 93/1, 125-146

p.127: Banné Member (Marcou 1848) ; Member of the Reuchenette Formation This member was first distinguished by Marcou (1848. p. 104) and called: "Marnes kimméridiennes ou du Banné". On page 105 he also wrote about "Calcaires (limestones) kimméridiens ou du Banné" overlying his Marnes du Banné. The term Calcaires du Banné was fortunately ignored by subsequent authors and can be rated to be forgotten. Later the Banné Member as it is known today was called Pterocera marl by several mapping geologlists as for instance Schneider (1960, p. 10). The Banné Member is named after the hill called Le Banné 1 km south of Porrentruy. Canton Jura. LK 1085 St-Ursanne. A thin veneer of the lowest part of the Banné Member covers the almost flat top of the hill, and bivalves and gastropods that are characteristic of the member can be collected there from the fields. No outcrop of the member exists at this time on Le Banné hill that is to be considered as type locality. A large and complete outcrop of the member is at present in the quarry at the locality called L'Alombre aux Vaches 2 km southwest of Courgenay. Canton Jura. LK 1085 St-Ursanne. This is the unpublished section RG 341 at coordinates 574.800/248.200 that is here designated as the reference section of the member. The unit is there a yellowish marl with a thickness of 5.2 m. The marl is relatively rich in carbonate in the middle. It contains in the lower part a profusion of bivalves and numerous gastropods and brachiopods. The member could be dated biochronologically at this locality by the ammonite Aspidoceras cf. acanthicum (Oppel) MNHB J 30714 found by A. and H. Zbinden and figured by Gygi (1995. Fig. 17/4). The age of the member is the Acanthicum Chron. The Banné Member occurs around Porrentruy and to the south to Glovelier. Canton Jura. Further south the member grades into unfossiliferous limestone ofthe Reuchenette Formation.