Grünten-Member

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Representation and status

Index
c6G
Color CMYK
(0%,38%,38%,6%)
Color RGB
R: 240 G: 150 B: 150
Rank
lithostratigraphic Member (Subformation)
Validity
Unit is in Use
Status
valid formal name
Scs Note

Angenommen.

Scs Date
19.10.2006
Status discussion

Nomenclature

Deutsch
Grünten-Member
Français
Membre du Grünten
Italiano
Membro del Grünten
English
Grünten Member
Origin of the Name

Grüntengipfel (Allgäu) NE Sonthofen

Historical Variants

Grüntenschichten p.p. (Heim 1919, 1933), Grünten-Schichten (Gebhard 1983, 1985), Grünten-Member (Bollinger 1988), Grünten Member = upper Orbitolina Beds (Föllmi et al. 2007)

Description

Description

... marly base, gradually passing into sandy limestones and finally to crinoidal-bryozoan limestones. "Das Grünten-Member besteht aus siltig-sandigen, schwach glaukonitischen, kalkigen, zu schiefriger Ausbildung neigenden Mergeln sowie mittelbankigen, schwach sandigen, glaukonitführenden, spätig bioklastischen Kalken von bräunlich-grauer Anwitterung…" S.30

Thickness
5-7 m; max. ca. 35 m (Föllmi et al. 2007)

Components

Mineral Content
  • glauconite
Fossil Content
  • crinoids
  • bryozoans
  • orbitolinids

Hierarchy and sequence

Superordinate unit
Subordinate units
Units at roof
Units at floor

Age

Age at top
  • Early Aptian
Note about top

furcata-Zone (Gainon 2001, Linder et al. 2006, Föllmi et al. 2007)

Age at base
  • Early Aptian
Note about base

deshayesi-Zone (Gainon 2001, Linder et al. 2006, Föllmi et al. 2007)

Dating Method

Biostratigraphie: Ammoniten in der hangenden Luitere-Schicht.

Geography

Geographical extent
Nur im distalen Bereich des Helvetikums in Allgäu, Vorarlberg und Zentralschweiz.
Type area
Grünten (Allgäu, D)

Palaenography and tectonic

  • Gault
  • Cretaceous of the Helvetics
Paleogeography
South Helvetic Domain
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Metamorphism
non metamorphic

References

Definition
Linder Pascal, Gigandet Johann, Hüsser Jean-Luc, Gainon François, Föllmi Karl B. (2006) : The early Aptian Grünten Member: description of a new lithostratigraphic unit of the Helvetic Garschella Formation. Eclogae geol. Helv. 99/3, 327-341

  • Selli level (OAE 1a)

    Name Origin

    Named after the Italian geologist Raimondo Selli (1916-1983).

    Rank
    Oceanic Anoxic Event
    Status
    valid
    In short

    Oceanic anoxic event at the base of the Aptian (around 120 Ma ago) with a major impact on the chemistry of the oceans worldwide.

    Age
    Early Aptian
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  • Oberer Teil des Grünten-Members

    Rank
    lithostratigraphic unit
    Status
    incorrect name (though informally used)
    Show details

  • Banc du Col de la Plaine Morte

    Name Origin

    Col de la Plaine Morte (VS)

    Rank
    lithostratigraphic Bed
    Status
    local name (informal)
    Valid term
    Luitere-Bank Gruenten-Member
    In short

    Niveau noduleux phosphaté à rares ammonites d'occurrence locale, soulignant une limite de séquence au sein du Membre du Grünten. Ce niveau se confond ailleurs avec le Banc du Luitere (à la base du Membre de la Brisi).

    Age
    Early Aptian
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  • Unterer Teil des Grünten-Members

    Rank
    lithostratigraphic unit
    Status
    incorrect name (though informally used)
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  • Rohrbachstein-Bank

    Name Origin

    Westflank des Rohrbachsteins (VS)/(BE), Rawilgebiet

    Rank
    lithostratigraphic Bed
    Status
    informal term
    In short

    Im Gelände gut abtrennbare Basisschicht des Grünten-Members in distalen Bereichen des Helvetikums. Grobkörniger, oft glaukonitführender Kalkarenit.

    Age
    Early Aptian
    Show details
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