Membre de Buix
Torna a Alto Reno, parta nordRappresentazione e statuto
- Colore CMYK
- (0%,5%,3%,25%)
- Colore RGB
- R: 190 G: 180 B: 185
- Rango
- Membro litostratigrafico (Sotto-formazione)
- Uso
- Unità in uso.
- Status
- termine formale valido
- Discussione del statuto
Nomenclatura
- Deutsch
- Buix-Member
- Français
- Membre de Buix
- Italiano
- Membro di Buix
- English
- Buix Member
- Origine del nome
- Carrière Les Creppes, NW de Buix = Bux (JU)
- Varianti storiche
- Kreide von St. Ursanne auct., Buix Member (Gygi 2000b, Gygi 2000c), Membre de Buix (Comment & Ayer)
Links
- Synonymi
Descrizione
- Descrizione
- Weisse, weiche, kreidige, ungeschichtete Kalksteine mit kleinen Biohermen, im oberen Teil treten Silex-Knollen auf.
- Geomorfologia
- zone tendre
- Potenza
- 0-35 m
Componenti
Fossili
- coralli
Gerarchia e successione
- Unità di rango superiore
- Unità sovrastante
- Unità sottostante
Età
- Geomorfologia
-
- Oxfordiano medio
- Età alla base
-
- Oxfordiano medio
- Metodo di datazione
- Biostratigraphie (ammonites de la Transversarium-Zone ; Gygi 1995)
Geografia
- Estensione geografica
- Partie nord du canton du Jura (Ajoie) et jura bâlois (région de Liesberg).
- Località-tipo
-
-
Buix (JU)
Caratteristiche del sito- typische Fazies
- Steinbruch, Tongrube
- (2569670 / 1259815)
- Carrière Les Creppes (Gygi 2000b S.56 Profil RG347)
-
Buix (JU)
- Sezione di riferimento
-
-
St-Ursanne (JU)
Caratteristiche del sito- Untergrenze
- typische Fazies
- Steinbruch, Tongrube
- (2579200 / 1246370)
- 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)
-
St-Ursanne (JU)
Paleogeografia e tettonica
- Termini generici
-
-
Jura
:
Juragebirge
-
Jura
:
- Tipo di origine
-
- sedimentaria
- Condizioni di formazione
- "Rauracien", crayeux (faciès lagunaire)
- Metamorfismo
- non metamorfo
Referenze
- Definizione
-
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
(
- Revisione
-
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).
- Pubblicazioni importanti
-
1962) : Beiträge zur Kenntnis des unteren Malm im zentralen Schweizer Jura. Mitt. geol. Inst. ETH und Univ. Zürich(