Membre du Balmi (-grabe/-wald)

Representation and status

Color CMYK

(0%,29%,56%,6%)

Color RGB

R: 240 G: 170 B: 105

Rank

lithostratigraphic Member (Subformation)

Validity

Unit is in Use

Status

valid formal name

Scs Note

Vom SKS angenommen.

Scs Date

27.04.2017

Nomenclature

Deutsch

Balmi-Member

Français

Membre du Balmi (-grabe/-wald)

Italiano

Membro del Balmi (-grabe/-wald)

English

Balmi Member

Origin of the Name

Balmigrabe / Balmiwald (BE), NW Wiriehore

Historical Variants

Balmi Member (Baud et al. 2016)

Nomenclatorial Remarks

Bereich der spätigen Lumachellen und überlagernden Dolomite (Genge 1958), Cycle III (Baud & Mégard-Galli 1975)

Description

Thickness

67 m au Seehore (Genge 1958), tronqué tectoniquement dans les autres secteurs (Baud et al. 2016).

Components

• crinoids
• bivalves

Costatoria goldfussi, Encrinus liliiformis, Sephardiella truempy (Hirsch).

Hierarchy and sequence

Subordinate units

• Couches à Costatoria goldfussi

Units at roof

• Membre des Erpilles

Age

Age at top

• Early Ladinian

Age at base

• Earliest Ladinian

Dating Method

Bivales (Costatoria goldfussi) et conodontes (Sephardiella truempy (Hirsch)) (Baud et al. 2016).

Geography

Type area

Diemtigtal (BE), Wiriehorn-Rothorn-Schuppe

Type locality

• Balmi (BE), NW Wiriehore
  Site particularities
  • Untergrenze
  • typische Fazies
  Coordinates
  • (2605700 / 1159500)
  Note
  • Baud et al. 2016 ; limite supérieure absente du fait de la présence du chevauchement des Spillgerten

Type profile

• Balmi (BE), NW Wiriehore
  Site particularities
  • Untergrenze
  • typische Fazies
  Site accessibility
  • Grat
  Coordinates
  • (2605700 / 1159500)
  Note
  • Baud et al. 2016 Suppl. Mat. Fig. e ; limite supérieure absente du fait de la présence du chevauchement des Spillgerten

Reference profiles

• Rocher Plat - Rocher Pourri (VD)
  Site particularities
  • Obergrenze
  • Untergrenze
  • typische Fazies
  Site accessibility
  • Grat
  Coordinates
  • (2581020 / 1145290)
  Note
  • Baud et al. 2016 Suppl. Mat. Fig.g: 45 m

Palaenography and tectonic

• Triassic of the Briançonnais

Paleogeography

Briançonnais Terrane :

microcontinent briançonnais

Tectonic unit (resp. main category)

• Médianes rigides :
  nappe des Préalpes Médianes rigides

Kind of protolith

• sedimentary

Metamorphism

non metamorphic

References

Definition

Baud Aymon, Plasencia Pablo, Hirsch Francis, Richoz Sylvain (2016) : Revised middle Triassic stratigraphy of the Swiss Prealps based on conodonts and correlation to the Brianc¸onnais (Western Alps). Swiss J. Geosc. 109/2, 365-377

p.368: Transgressive from the bottom, the Balmi Member (Online Resources 1 and 3) starts with light coloured dolo-grainstone, followed by the large transgressive unit of the ‘‘Couches à Costatoria goldfussi’’ that represents the peak of the transgression (MFS). It ends with the sudden appearance of crinoidal limestone, with a brown dolomite at its top.