Membre de Buix

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Representation and status

Index
-
CMYK Color
-
RGB color
R: 190 G: 180 B: 185
Rank
lithostratigraphic Member
Validity
Unit is in Use
Status
valid formal name
SCS note
-
SCS date
-
Comment
Le Membre de Buix est en partie l'équivalent latéral du Membre du Tiergarten.

Nomenclature

German
Buix-Member
French
Membre de Buix
Italian

Membro di Buix

English
Buix Member
Origin of the Name
Carrière Les Creppes, NW de Buix = Bux (JU)
Historical Variants
Kreide von St. Ursanne auct., Buix Member (Gygi 2000b, Gygi 2000c)
Nomenclatorial Remarks
-

Synonyms

Non-synonyms
Possible confusion

Description

Description
Weisse, weiche, kreidige, ungeschichtete Kalksteine mit kleinen Biohermen, im oberen Teil treten Silex-Knollen auf.
Geomorphology
zone tendre
Thickness
0 bis 35 m

Components

Lithological content
-
Mineral content
-
Fossil content
  • corals

Hierarchy and succession

Superordinate unit
Formation de St-Ursanne
Subordinate units
Lateral equivalents
Upper boundary
-
Lower boundary
-
Stratigraphic discussion
-

Age

Age at top
middle Oxfordian
Note about top
-
Age at base
middle Oxfordian
Note about base
-
Dating method
Biostratigraphie (ammonites de la Transversarium-Zone ; Gygi 1995)

Geography

Geographical extent
Partie nord du canton du Jura (Ajoie) et jura bâlois (région de Liesberg).
Type area
-
Type locality
  • Buix (JU)
    Site particularities
    • typical facies
    Site accessibility
    • quarry
    Coordinates
    • (2569670 / 1259815)
    Note
    • Carrière Les Creppes (Gygi 2000b S.56 Profil RG347)
Type profile
-
Reference profiles
  • St-Ursanne (JU)
    Site particularities
    • lower boundary
    • typical facies
    Site accessibility
    • quarry
    Coordinates
    • (2579200 / 1246370)
    Note
    • 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)
Point of interest
-

Paleogeography and tectonic

Paleogeography
-
Kind of protolith
  • sedimentary
Conditions of formation
"Rauracien", crayeux (faciès lagunaire)
Sequence
-
Tectonic Unit (resp. main category)
Jura
  • Southern Germany
  • Black Forest
Metamorphism
non metamorphic
Metamorphic facies
-
Note on metamorphism
-

References

Definition
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
Revision
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).
Important publications

Material and varia

Applications
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