Marne du Banné

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Rappresentazione e statuto

Index
i7B
Colore CMYK
cf. Formation de Reuchenette
Colore RGB
R: 145 G: 205 B: 215
Rango
Membro litostratigrafico (Sotto-formazione)
Uso
Unità in uso.
Status
termine formale valido
Discussione del statuto

Nomenclatura

Deutsch
Banné-Mergel
Français
Marne du Banné
Italiano
Marna del Banné
English
Banné Marl
Origine del nome

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

Varianti storiche

«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)

Descrizione

Descrizione

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

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

Componenti

Fossili
  • ammoniti
  • vertebrati
  • gasteropodi
  • nautili
  • brachiopodi
  • bivalvi

Gerarchia e successione

Unità di rango superiore
Unità sovrastante
Unità sottostante

Età

Geomorfologia
  • Primo Kimmeridgiano
Osservazioni sul tetto

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

Età alla base
  • Primo Kimmeridgiano
Osservazioni sulla base

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

Metodo di datazione

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).

Geografia

Estensione geografica
Partie nord des cantons du Jura et de Neuchâtel.
Regione-tipo
Ajoie (JU), et plus particulièrement la région de Porrentruy
Località-tipo
  • Le Banné (JU)
    Caratteristiche del sito
    • typische Fazies
    • Fossilfundstelle
    Agibilità del sito
    • temporary exposure
    Coordinate
    • (2572215 / 1250610)
    Nota
    • <p>Localité-type du Membre du Banné (Gygi 2000c, Comment et al. 2015): colline 1 km au sud de Porrentruy</p>
Sezione di riferimento
  • Courgenay - Alombre (JU)
    Caratteristiche del sito
    • Obergrenze
    • typische Fazies
    Agibilità del sito
    • Steinbruch, Tongrube
    Coordinate
    • (2574750 / 1248150)
    Nota
    • <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>

Paleogeografia e tettonica

  • Malm
Termini generici
Tipo di origine
  • sedimentaria
Condizioni di formazione

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

Metamorfismo
non metamorfo

Referenze

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

p.104
Revisione
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.
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