Sardona-Decke

Back to Sardona nappe

Representation and status

Color CMYK
N/A
Color RGB
R: 241 G: 239 B: 237
Rank
nappe
Validity
Unit is in Use
Status
valid

Nomenclature

Deutsch
Sardona-Decke
Français
Nappe du Sardona
Italiano
Falda del Sardona
English
Sardona Nappe
Origin of the Name

Alp bzw. Piz Sardona (SG), Calfeisen(tal)

Historical Variants

Sardona unit (Lihou 1995), Sardona-Decke (den Brok et al. 2021), Sardona Nappe (Gouffon et al. 2024)

Nomenclatorial Remarks

Piz Sardona >>> du Sardona, mais Alpe de Sardona

Description

Description

Ultrahelvetische Decke in infrahelvetische Stellung. Stratigraphisch durch seine durchgehende klastische Flyschfazies charakterisiert, mit dem Sardona-Quarzit als prominentem Leithorizont.

Hierarchy and sequence

Units at floor
Upper boundary

Lochsiten-Kalk, Subhelvetische Decken, Oberhelvetikum

Lower boundary

Blattengrat-Decke

Age

Age at top
  • middle Eocene
Age at base
  • Late Cretaceous

Palaenography and tectonic

Paleogeography
Ultrahelvetic Domain
Tectonic unit (resp. main category)
Kind of protolith
  • tectonic
Conditions of formation

Deep marine flysch deposits of Late Cretaceous to mid Eocene age (Lihou 1993, 1995).

References

Definition
Gouffon Yves (Editor) (2024) : Tectonic Map of Switzerland 1:500000, Explanatory notes. Federal Office of Topography swisstopo, Wabern

p.36: Three allochthonous units, which were emplaced in an early phase onto the future Helvetic domain (see p. 31), crop out in the area between Linthal and Sargans. They are composed mainly of Late Cretaceous to Paleogene sediments deposited in the very distal part of the Helvetic realm: Blattengrat and Bad Ragaz nappes of South Helvetic, Sardona Nappe of Ultrahelvetic affinity. The three units were subsequently truncated by the Glarus Thrust, which is the basal thrust of the Upper Helvetic subdomain, and simultaneously cut by out-of-sequence thrusts also involving both the basement and the cover of the Aar Massif (see § 4.1.1, Fig. 5).

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