Mezzaun-Member

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Representation and status

Index
-
CMYK Color
-
RGB color
R: 185 G: 135 B: 125
Rank
lithostratigraphic Member
Validity
Unit is in Use
Status
informal term
SCS note
-
SCS date
-
Comment
-

Nomenclature

German

Mezzaun-Member

French
Membre du (Piz) Mezzaun
Italian
Membro del (Piz) Mezzaun
English

Mezzaun Member

Origin of the Name

Piz Mezzaun (GR), Madulain

Historical Variants
Kieselschnurlias des Typus Mezzaun = Mezzaun-Lias (Roesli 1945), Mezzaun-Formation (Schüpbach 1974), Mezzaun-Schichten = Megazyklus der Val Chamuera (Eberli 1985), Mezzaun Beds (Furrer et al. 1985), Mezzaun-Schichten, Kieselige Kalke = Albula-Lias = Mezzaun-Member (Furrer et al. 2015)
Nomenclatorial Remarks
-

Synonyms

Synonyms
Non-synonyms
Possible confusion

Description

Description
Resedimente ; Kalke mit Glimmersand und Echinodermenfragmenten (Trümpy et al. 1997). Furrer et al. 1985 p.30: Ferro-manganese bearing shales (Manganese Shales, 1-35 m) separate this cycle [Trupchun Beds] from a second megacycle of resediments (Mezzaun Beds, 100-350 m), which is found only in the west, in the Ela and Bernina nappe.
Geomorphology
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Thickness
10-350 m, 150 m an der Typlokalität (Furrer et al. 2015).

Components

Lithological content
-
Mineral content
-
Fossil content
  • sponges
  • trace fossils
  • crinoids

Hierarchy and succession

Superordinate unit
Allgäu-Formation
Subordinate units
Units at roof
Units at floor
Blaisun-Member
Lateral equivalents
Upper boundary
-
Lower boundary
Manganschiefer = Blaisun-Mb.
Stratigraphic discussion
-

Age

Age at top
Callovian
Note about top
-
Age at base
middle Toarcian
Note about base
-
Dating method
Cenoman [sic] (Staub 1946)

Geography

Geographical extent
-
Type area
-
Type locality
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Type profile
  • Piz Mezzaun (GR)
    Site particularities
    • typical facies
    Site accessibility
    • mountain ridge
    Coordinates
    • (2794300 / 1160650)
    Note
    • Eberli 1985: bis 2794550 / 1160450
Reference profiles
  • Piz Blaisun (GR)
    Site particularities
    • typical facies
    Site accessibility
    • mountain ridge
    Coordinates
    • (2785550 / 1163000)
    Note
    • Eberli 1985: bis 2785550 / 1163300
Point of interest
-

Paleogeography and tectonic

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

References

Definition
Schüpbach M. A. (1974): Comparison of slope and basinal sediments of a marginal cratonic basin (Pedregosa Basin, New Mexico) and a marginal géosynclinal basin (southern border of Piemontais Geosyncline, Bernina Nappe, Switzerland). , PhD thesis, Rice Univ. (Houston, Texas)
Revision
Eberli Gregor Paul (1985): Die jurassischen Sedimente in den ostalpinen Decken Graubündens - Relikte eines passiven Kontinentalrandes. , Diss. ETH Zürich, 203 Seiten

S.164: Die Mezzaun-Schichten entsprechen der von Schüpbach (1974) definierten Mezzaun-Formation, deren Typlokalität am nemengebenden Berg, dem Piz Mezzaun liegt. Da die Mezzaun-Formation sich lithologisch und von ihrer Stellung im Liegenden der Radiolarite mit Teilen der Allgäu-Formation vergleichen lässt, wird die Mezzaun-Formation als Member in diese eingegliedert und neu als Mezzaun-Schichten bezeichnet.
Important publications
  • 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.

Material and varia

Applications
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