Membre de Buix

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Darstellung und Status

Farbe CMYK
(0%,5%,3%,25%)
Farbe RGB
R: 190 G: 180 B: 185
Rang
lithostratigraphisches Member (Subformation)
Gebrauch
Element ist in Gebrauch
Status
gültiger formeller Begriff
Diskussion des Status

Nomenklatur

Deutsch
Buix-Member
Français
Membre de Buix
Italiano
Membro di Buix
English
Buix Member
Herkunft des Namens
Carrière Les Creppes, NW de Buix = Bux (JU)
Historische Varianten
Kreide von St. Ursanne auct., Buix Member (Gygi 2000b, Gygi 2000c), Membre de Buix (Comment & Ayer)

Links

Synonyme
Kreidige Kalke von St-Ursanne

Beschreibung

Beschreibung
Weisse, weiche, kreidige, ungeschichtete Kalksteine mit kleinen Biohermen, im oberen Teil treten Silex-Knollen auf.
Geomorphologie
zone tendre
Mächtigkeit
0-35 m

Komponenten

Fossilien
  • Korallen

Hierarchie und Abfolge

Übergeordnete Einheit
Hangendes
Liegendes

Alter

Alter Top
  • mittleres Oxfordien
Alter Basis
  • mittleres Oxfordien
Datierungsmethode
Biostratigraphie (ammonites de la Transversarium-Zone ; Gygi 1995)

Geografie

Geographische Verbreitung
Partie nord du canton du Jura (Ajoie) et jura bâlois (région de Liesberg).
Typlokalität
  • Buix (JU)
    Merkmale des Ortes
    • typische Fazies
    Zugänglichkeit des Ortes
    • Steinbruch, Tongrube
    Koordinaten
    • (2569670 / 1259815)
    Notizen
    • Carrière Les Creppes (Gygi 2000b S.56 Profil RG347)
Referenzprofile
  • St-Ursanne (JU)
    Merkmale des Ortes
    • Untergrenze
    • typische Fazies
    Zugänglichkeit des Ortes
    • Steinbruch, Tongrube
    Koordinaten
    • (2579200 / 1246370)
    Notizen
    • Referenzprofil im ehemaligen Steinbruch der Kalkfabrik in St-Ursanne (Pümpin 1965 Pl.1 Profil 2, Gygi 1982 Fig.4, Gygi 2000b p.56 Profil RG336, Gygi 2000c)

Paläogeografie und Tektonik

Tektonische Einheit (bzw. Überbegriff)
Herkunftstyp
  • sedimentär
Bildungsbedingungen
"Rauracien", crayeux (faciès lagunaire)
Metamorphose
unmetamorph

Referenzen

Erstdefinition
Gygi R. A. (2000) : Integrated stratigraphy of the Oxfordian and Kimmeridgian (Late Jurassic) in northern Switzerland and adjacent southern Germany. Denkschriften der Schweizerischen Akademie der Naturwissenschaften 104, 152 S.

p.56
Neubearbeitung
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.128: Buix Member (Gygi 2000b). Previously "Kreide von St. Ursanne" ; Member of the St-Ursanne Formation (Synonymy: Gygi 2000b p. 56) The Buix Member was renamed by Gygi (2000b. p. 56). lt is named after the village of Buix north of Porrentruy in Canton Jura (LK 1065 Bonfol) where it crops out in the quarry of Les Creppes (unpublished section RG 347) where it is easily accessible. However, the base ofthe member is not visible in that quarry. A complete outcrop of the member is in the quarry of the former lime works near the railway station of St-Ursanne, Canton Jura. This section has been studied in detail by Pümpin (1965. PI. 1. section 2). Gygi (2000b. p. 56) proposed beds 8-10 in Pümpin's section to be the reference section of the Buix Member. A schematic version of this section was later published by Gygi (1982. Fig. 4). This is section RG 336 at coordinates 579.200/246.370. LK 1085. St-Ursanne. The Buix Member is a massive, yellowish-white to pure white, more or less porous and friable limestone which was compared with chalk by Ziegler (1962). Coral bioherms occur in this unit near Leymen. France. Flüh, Canton Solothurn, and Delémont. St-Ursanne and Buix. Canton Jura. Locally, the limestone was slightly dolomitic. but the euhedral dolomite crystals have been dissolved and left empty pores as in the unpublished section RG 344. beds 3 and 8 near Courtemaîche, Canton Jura. In this case, the rock weathers in perpendicular rods as was observed by Liniger (1970. p. 7). Large chert nodules occur in the upper Buix Member in the sections RG 343 and 344 at Courtemaîche. The mean thickness of the member is about 35 m. The age was established biochronologically with ammonites by Gygi (1995. Fig. 2) that were found by V. Pümpin at St-Ursanne near the boundary between the Antecedens and the Luciaeformis Subzones in the Transversarium Zone. The Buix Member occurs in the Ajoie region in the northern part of Canton Jura and near Liesberg. Canton Baselland. It is the lagoonal facies of the upper St-Ursanne Formation (Fig. 1).
Wichtige Publikationen
Ziegler M. A. (1962) : Beiträge zur Kenntnis des unteren Malm im zentralen Schweizer Jura. Mitt. geol. Inst. ETH und Univ. Zürich
Pümpin V.F. (1965) : Riffsedimentologische Untersuchungen im Rauracien von St. Ursanne und Umgebung (Zentraler Schweizer Jura). Eclogae geol. Helv. 58/2, 799-876
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