Evaporiti dei Gessi

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Representation and status

Index
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CMYK Color
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RGB color
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Rank
lithostratigraphic unit
Validity
Unit is in Use
Status
local name (informal)
SCS note
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SCS date
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Comment
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Nomenclature

German
Gess-Evaporit
French
Evaporite des Gessi
Italian
Evaporiti dei Gessi
English
Gess Evaporite
Origin of the Name

Gess = I Gessi (GR)

Historical Variants
Gipsen von Gessi am Berninapass und in Val Federia (Staub & Cadisch 1921), conca de I Gessi (Godenzi 1963), Val di Gess Mb. (Furrer et al. 1985)
Nomenclatorial Remarks
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Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
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Geomorphology
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Thickness
Ca. 30 m (Furrer et al. 1985).

Components

Lithological content
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Mineral content
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Fossil content
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Hierarchy and succession

Superordinate unit
Subordinate units
Units at roof
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Units at floor
Lateral equivalents
Upper boundary
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Lower boundary
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Stratigraphic discussion
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Age

Age at top
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Note about top
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Age at base
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Note about base
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Dating method
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Geography

Geographical extent
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Type area
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Type locality
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Type profile
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Reference profiles
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Point of interest
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Paleogeography and tectonic

Paleogeography
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Kind of protolith
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Conditions of formation
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Sequence
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Tectonic Unit (resp. main category)
Bernina nappe complex
  • Bernina
  • Mezzaun :
    = Müsella-Schuppe = Corn-Kristallin
  • Madulain :
    = Albula-Schuppenzone / Albula-Steilzone
  • Julier nappe
Metamorphism
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Metamorphic facies
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Note on metamorphism
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References

Definition
Furrer Heinz (Ed.) (1985): Field workshop on Triassic and Jurassic sediments in the Eastern Alps of Switzerland. , Mitt. geol. Inst. ETH und Univ. Zürich (N.F.) 248, 81 S.

p.72: In the upper part [of the Fuorn Fm.] (Val di Gess Mb.) we find characteristic gypsum layers and lenses intercalated in a succession of mostly green siltstones, sandy dolomites, cornieules and carbonaceous sandstones. Lenticular bedding is rather common. The sandstones are often of the greywacke type. Detrital volcanic quartz grains are abundant, especially in the massive sandstone body above a possible erosional surface in the midle of the Val di Gess Mb. Here they dominate and are well rounded. Some very fine placerlike Zirconium/Pyrite layers can be found. Albite, muscovite and chlorite are also common due to regional metamorphism (lower greenschist facies); this metamorphism also caused strong recrystallisation, with destruction of nearly all primary structures.
Revision
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Important publications
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Material and varia

Applications
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