Laufen-Member

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Rappresentazione e status

Sigla
-
Colori CMYK
siehe Balsthal-Formation
Colori RGB
R: 170 G: 195 B: 215
Rango
Membro litostratigrafico
Uso
Unità in uso.
Status
termine formale valido
SCS nota
-
SCS data
-
Commento
-

Nomenclatura

Tedesco
Laufen-Member
Francese
Membre de Laufon
Italiano
Membro di Laufen
Inglese
Laufen Member
Origine del nome

Laufen (BL)

Varianti storiche
Laufenerstein, Laufen-Schichten (Gygi 1995 S.13), Roche de Laufon = Laufner Kalk (Bollin 1996), Laufen Member (Gygi 2000c), Membre de Laufon
Osservazioni sul nome
-

Sinonimi

Sinonimo
Non-sinonimo
Confusione possibile

Descrizione

Descrizione
Das Laufen-Member besteht aus sehr variablen, geschichteten Kalksteinen der Balsthal-Formation: Mikrite, Oolithe, dolomitische Onkolithe bis zu koralligenen Kalken. Onkoide treten an der Basis vor («akzessorische Mumienbänke»). Häufige Fossilien: Bivalven und Brachiopoden, keine Ammoniten.
Espressione geomorfologica
-
Potenza
16 m and der Typlokalität (Gygi 2000b/c), bis 25-30 m auf Bl. Chasseral (Aufranc et al. 2017)

Componenti

Litologia
  • limestone, oolithic
  • calcare
  • limestone, micritic
Minerali
-
Fossili
  • ostreidi
  • brachiopodi
  • echinoidi
  • bivalvi

Gerarchia e successione

Unità di rango superiore
Balsthal-Formation
Unità di rango inferiore
Unità sovrastante
Unità sottostante
Steinibach-Member
Equivalente laterale
Limite superiore
-
Limite inferiore
-
Osservazioni sulla stratigrafia
-

Età

Età al tetto
Oxfordiano tardo
Osservazioni sul tetto
-
Età alla base
Oxfordiano tardo
Osservazioni sulla base
-
Metodo di datazione
Klastische Schüttungen (Gygi & Persoz 1986) und Sequenz-Stratigraphie (Gygi et al. 1998).

Geografia

Estensione geografica
Nordwestschweiz.
Regione-tipo
Località-tipo
  • Laufen (BL)
    Caratteristiche del sito
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2604950 / 1252150)
    Nota
    • Tal der Schachtele Nördlich Laufen (Gygi 2000c Profil RG457)
Sezione-tipo
  • Liesberg (BL)
    Caratteristiche del sito
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2600430 / 1250338)
    Nota
    • Zement-Steinbruch (Gygi 2000b Fig.35 und Pl.32)
Sezione di riferimento
-
Punti d'interesse
  • Gorges de Court
    Caratteristiche del sito
    • upper boundary
    • lower boundary
    • typical facies
    Coordinate
    • (2594580 / 1238050)
    Nota
    • Hug 2001, Wetzel & Strasser 2001

Paleogeografia e tettonica

Paleogeografia
Northern Tethyan Carbonate Platform (Jura > Helv.) :
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP) ,
Tipo di protolito
  • sedimentaria
Condizioni di formazione
-
Sequenza
-
Unità tettonica
Giura
  • S-DE
  • Schwarzwald
Metamorfismo
non metamorfo
Facies metamorfica
-
Osservazioni sul metamorfismo
-

Referenze

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.135: Laufen Member (Gygi 1995) ; Member of the Balsthal Formation ; Synonymy: Gygi (2000b. p. 62) The name Laufen Member was proposed by Gygi (1995 p.13). It is derived from the small medieval city of Laufen in Canton Baselland. LK 1087 Passwang. The upper part of the member is currently being quarried as a well-known building stone in the small valley of Schachlete north of Laufen, on the territory of the village of Dittingen (unpublished section RG 457 at coordinates 604.530/253.070). Complete sections of the member close to Laufen are above the cantonal road east of the former cement works at Liesberg (figured by Gygi 2000b. Fig. 35) and in the limestone quarry of the former Liesberg cement works (Gygi 2000b. Pl.32). Gygi (2000b, p. 62) proposed that beds no. 27-48 in this quarry be the type section of the Laufen Member. The member is 16 m thick in this section and is made up of bedded micritic limestone with oncoids near the base. The lithology of the Laufen Member is very variable. Micrite. pelmicrite. oncolite. oolite, oolitic oncolite. dolomitic oncolite or even coral limestone can occur. The Laufen Member is very fossiliferous in some places (Gygi 2000b. Fig. 19). Ostreid bivalves and ribbed brachiopods (Septaliphoria) are common. One ammonite has been found in the upper part of the member in the quarry Schmidlin in the Schachlete valley near Dittingen, Canton Baselland, by J. Jermann. Gygi (1995. Fig. 20) figured this Lithacosphinctes. but he could not identify it. It is only by means of mineral stratigraphy (Gygi & Persoz 1986) and sequence stratigraphy (Gygi et al. 1998) that the member can be dated at the Bimammatum and Hauffianum Subchrons of the Bimammatum Chron. The Laufen Member occurs in northwestern Switzerland. It grades laterally into the Oolithe rousse and into the lower La May Members in the proximal direction. The boundary to the lower Holzflue Member in the distal direction is also a transition.

Pubblicazioni importanti
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Materiale e vario

Utilizzazione
-
  • «akzessorische Mumienbänke» Mostra dettagli

    Origine del nome
    -
    Rango
    Strato litostratigrafico
    Status
    termine locale (informale)
    Nome da utilizzare
    In breve
    Onkolithisches Horizont an der Basis des Laufen-Members, am Übergang vom Hautes-Roches-Korallenkalk.
    Età
    Oxfordiano tardo - Oxfordiano tardo
    Potenza
    -
    Estensione geografica
    Anticlinaux de Vellerat, du Raimeux, du Moron et du Graitery.
    Regione-tipo
    -
    Commento
    -