Couches à Costatoria goldfussi

Representation and status

Color CMYK
(0%,29%,55%,4%)
Color RGB
R: 245 G: 175 B: 110
Rank
lithostratigraphic Bed
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Costatoria-goldfussi-Schichten
Français
Couches à Costatoria goldfussi
Italiano
Strati a Costatoria goldfussi
English
Costatoria goldfussi Beds
Origin of the Name

Nom basé sur l'abondance de l'espèce de bivalve fossile Myophoria (Costatoria) goldfussi Alberti 1830 (également présent dans le Membre des Erpilles sus-jacent).

Historical Variants

Lumachellen mit Myophoria goldfussi (Genge 1958), Calcaire à Costatoria goldfussi (Bottéron 1961), Couches à C. goldfussi (Baud & Mégard-Galli 1975, Sartori 1990), Calcaires à goldfussi (Mégard-Galli & Baud 1977), «Couches à Costatoria goldfussi» (Sartori et al. 2006, Baud et al. 2016)

Description

Description

sommet de la Formation de Champcella

Thickness
15 m au Mont d'Or (Botteron 1961).

Components

Fossil Content
  • Conodonts
  • bivalves

Myophoria (Costatoria) goldfussi, Sephardiella truempy (Hirsch)

Hierarchy and sequence

Superordinate unit

Age

Age at top
  • Early Ladinian
Age at base
  • Earliest Ladinian
Note about base

Zone à Curionii: Sephardiella truempyi (Hirsch) = Fassanien

Dating Method

Bivalves et conodontes (Hirsch) (Baud et al. 2016).

Geography

Type profile
  • Lyss Hütte (BE)
    Site particularities
    • Obergrenze
    • Untergrenze
    • typische Fazies
    Site accessibility
    • Strassenanschnitt / Bahnanschnitt
    Coordinates
    • (2601820 / 1155740)
    Note
    • Baud et al. 2016

Palaenography and tectonic

  • Triassic of the Briançonnais
Paleogeography
Briançonnais Terrane :

microcontinent briançonnais

Tectonic unit (resp. main category)

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.371: The ‘‘Couches à Costatoria goldfussi’’ form the bulk of the Balmi Member of the Pralet Formation in the Prealps (Fig. 3). Corresponding to the transgressive lower part of cycle CIII, it overlies undisturbed the Wiriehorn Formation (Champcella in the Briançonnais). These Costatoria goldfussi marker beds can be followed all the way down to the Mediterranean coast (Mégard-Galli and Baud 1977). It is most often dolomitized in the Western Alps. In the Seehorn section (Fig. 6), just north of the Rothorn thrust sheet, Genge (1958) described and illustrated Myophoria goldfussi, as well as Pectinids, Cyprinids, Dentalids and Aviculids. He also mentioned crinoids with Encrinus liliiformis and a Solenopora algae. Its faunal content in the Vanoise area of the French Alps has been described and illustrated by Ellenberger (1958). Among the bivalves, this author proposed the use of Myophoria goldfussi var. alpina as a marker. Bivalves comprise smooth Myophorids, Pachycardia and Trigonodus. Among gastropods figures Omphaloptycha (or Geinitzia) cf. escheri. Dolomitized ‘‘Couches à Costatoria goldfussi’’ are present in most of the Swiss Prealps ‘‘Préalpes médianes Rigides’’ thrust sheets (Botteron 1961; Genge 1958), but in the Eastern part of these Prealps they show rare but interesting limestone outcrops (Diemtigtal, sections 1, 2 and 3 in Figs. 5, 6). There, in-between dolomitic layers, the 5–10 m thick Costatoria goldfussi interval represents a level of lime-wackestone with some cherts in the lower part (Fig. 5), capped by crinoidal lime-packstone.
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