Olten-Member

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Rappresentazione e status

Sigla
i6K
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
Olten-Member
Francese
Membre d'Olten
Italiano
Membro d'Olten
Inglese
Olten Member
Origine del nome

Hardflue bei Olten (SO)

Varianti storiche
Oltener Korallenkalk (Gygi 1969), Olten-Member (Gygi 2000b/c)
Osservazioni sul nome
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Sinonimi

Sinonimo
Non-sinonimo
Confusione possibile

Descrizione

Descrizione

Das Olten-Member besteht aus dickgebankten bis massiven Kalksteinen, 10 bis 20% bestehen aus plattigen Korallen (Dimorphoseris und Stylina), die Zwischenräume des Bioherms sind mit biodetritischem Mikrit gefüllt. Kiesel-Konkretionen kommen im mittleren Teil vor.

Espressione geomorfologica
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Potenza
26 m an der Typlokalität (Gygi 1969, Gygi 2000c)

Componenti

Litologia
  • calcare
Minerali
-
Fossili
  • coralli

Gerarchia e successione

Unità di rango superiore
Balsthal-Formation
Unità di rango inferiore
Unità sovrastante
Unità sottostante
Balmberg-Oolith
Equivalente laterale
Limite superiore
-
Limite inferiore
Erste hermatypische Koralle.
Osservazioni sulla stratigrafia
-

Età

Età al tetto
Oxfordiano tardo
Osservazioni sul tetto
-
Età alla base
Oxfordiano tardo
Osservazioni sulla base
-
Metodo di datazione
Implizite Datierung durch Liegendes und Hangendes

Geografia

Estensione geografica
3 bis 4 km breiter Streifen in südwestlicher-nordöstlicher Ausdehnung von einigen Kilometern
Regione-tipo
Località-tipo
  • Steinbruch Born (SO)
    Caratteristiche del sito
    • upper boundary
    • lower boundary
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2633900 / 1242280)
    Nota
    • Gygi 2000c (nach Gygi 1969 Pl.18, Profil RG-21, Bänke 29-36 im Steinbruch 2.5 km südwestlich von Olten)
Sezione-tipo
  • Steinbruch Born (SO)
    Caratteristiche del sito
    • upper boundary
    • lower boundary
    • typical facies
    Agibilità del sito
    • quarry
    Coordinate
    • (2633900 / 1242280)
    Nota
    • Gygi 2000c (nach Gygi 1969 Pl.18, Profil RG-21, Bänke 29-36 im Steinbruch 2.5 km südwestlich von Olten)
Sezione di riferimento
-
Punti d'interesse
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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
Riffgürtel am Rand der raurazischen Plattform. Im späten Oxfordien wird der Plattformrand schliesslich durch das Korallenriff von Olten markiert.
Sequenza
-
Unità tettonica
Giura
  • S-DE
  • Schwarzwald
Metamorfismo
non metamorfo
Facies metamorfica
-
Osservazioni sul metamorfismo
-

Referenze

Definizione
Gygi R. A. (1969): Zur Stratigraphie der Oxford-Stufe (oberes Jura-System) der Nordschweiz und des süddeutschen Grenzgebietes. , Beitr. geol. Karte Schweiz N.F. 136, 143 S.

S.94: Korallenkalk
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.136: The Olten Member ("Oltener Korallenkalk") was named by Gygi (1969, p. 94). The name is derived from the city of Olten. LK 1088 Hauenstein, where the member forms a cliff on the northwestern slope of Hardflue hill above the railway goods yard of Olten (unpublished section RG 22, coordinates 635.550/244.980). Gygi (1969) did not designate a type locality.A complete section of the member is in the limestone quarry of the former cement works on the north slope of Mt. Born 2.5 km southwest of Olten that was measured by Gygi (1969. Pl. 18. section RG 21, coordinates 633.900/242.280). This quarry can serve as type locality. Beds 29-36 of section RG 21 are as signed to the Olten Member. The thickness of the Olten Member is 26 m in the type section. The lower part of the member is thick-bedded, whereas the upper part is massive. The matrix of the limestone is pure micrite below with varying admixtures of fine-grained biogenic detritus in the upper part. Chert nodules occur in the middle. 10-20% of the rock volume are mostly dish-shaped coral colonies of the genera Dimorphoscris and Stylina as well as undifferentiated microsolenids (Gygi 2000b. Fig. 12). The base of the member is where the first hermatypic corals appear, and the top where corals disappear. The geometry of the member is progradational (Gygi & Persoz 1986. PI. 1A). The most proximal individual patch reefs appear in the distal time equivalent of the Steinebach Member in the gorge 1 km northwest of Wangen near Olten. At the time of maximum development the coral limestone belt must have grown to a width of 3-4 km and may have been a bank reef. Gygi (1969. p. 95) pointed out that the reef front and the fore-reef ramp must have had a very subdued relief. Growth of the coral bank ceased during deposition of the upper Holzflue Member and the upper Letzi Member.
Pubblicazioni importanti
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Materiale e vario

Utilizzazione
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