Laufen-Member

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Representation and status

Index
-
CMYK Color
siehe Balsthal-Formation
RGB color
R: 170 G: 195 B: 215
Rank
lithostratigraphic Member
Validity
Unit is in Use
Status
valid formal name
SCS note
-
SCS date
-
Comment
-

Nomenclature

German
Laufen-Member
French
Membre de Laufon
Italian
Membro di Laufen
English
Laufen Member
Origin of the Name

Laufen (BL)

Historical Variants
Laufenerstein, Laufen-Schichten (Gygi 1995 S.13), Roche de Laufon = Laufner Kalk (Bollin 1996), Laufen Member (Gygi 2000c), Membre de Laufon
Nomenclatorial Remarks
-

Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
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.
Geomorphology
-
Thickness
16 m and der Typlokalität (Gygi 2000b/c), bis 25-30 m auf Bl. Chasseral (Aufranc et al. 2017)

Components

Lithological content
  • oolithic limestone
  • limestone
  • micritic limestone
Mineral content
-
Fossil content
  • ostreids
  • brachiopods
  • echinoids
  • bivalves

Hierarchy and succession

Superordinate unit
Balsthal-Formation
Subordinate units
Units at roof
Units at floor
Steinibach-Member
Lateral equivalents
Upper boundary
-
Lower boundary
-
Stratigraphic discussion
-

Age

Age at top
late Oxfordian
Note about top
-
Age at base
late Oxfordian
Note about base
-
Dating method
Klastische Schüttungen (Gygi & Persoz 1986) und Sequenz-Stratigraphie (Gygi et al. 1998).

Geography

Geographical extent
Nordwestschweiz.
Type area
Type locality
  • Laufen (BL)
    Site particularities
    • typical facies
    Site accessibility
    • quarry
    Coordinates
    • (2604950 / 1252150)
    Note
    • Tal der Schachtele Nördlich Laufen (Gygi 2000c Profil RG457)
Type profile
  • Liesberg (BL)
    Site particularities
    • typical facies
    Site accessibility
    • quarry
    Coordinates
    • (2600430 / 1250338)
    Note
    • Zement-Steinbruch (Gygi 2000b Fig.35 und Pl.32)
Reference profiles
-
Point of interest
  • Gorges de Court
    Site particularities
    • upper boundary
    • lower boundary
    • typical facies
    Coordinates
    • (2594580 / 1238050)
    Note
    • Hug 2001, Wetzel & Strasser 2001

Paleogeography and tectonic

Paleogeography
Northern Tethyan Carbonate Platform :
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP) ,
Kind of protolith
  • sedimentary
Conditions of formation
-
Sequence
-
Tectonic Unit (resp. main category)
Jura
  • Southern Germany
  • Black Forest
Metamorphism
non metamorphic
Metamorphic facies
-
Note on metamorphism
-

References

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.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.

Important publications
-

Material and varia

Applications
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  • «akzessorische Mumienbänke» Show details

    Origin of the Name
    -
    Rank
    lithostratigraphic Bed
    Status
    local name (informal)
    Valid name
    In Short
    Onkolithisches Horizont an der Basis des Laufen-Members, am Übergang vom Hautes-Roches-Korallenkalk.
    Age
    late Oxfordian - late Oxfordian
    Thickness
    -
    Geographical extent
    Anticlinaux de Vellerat, du Raimeux, du Moron et du Graitery.
    Type area
    -
    Comment
    -