Emmat-Formation

Back to Austroalpine

Representation and status

Color CMYK
(12%,0%,48%,18%)
Color RGB
R: 185 G: 210 B: 110
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term
Status discussion

Nomenclature

Deutsch
Emmat-Formation
Français
Formation d'Emmat
Italiano
Formazione d'Emmat
English
Emmat Formation
Origin of the Name

Emmat (GR), Bivio

Historical Variants
Neocom = Neocomschiefer = Neocomkalke und -schiefer (Stöcklin 1949), Roccabella-Schiefer (Dietrich 1970), Emmat-Serie (Finger 1978), Emmat-Schiefer (Lüdin 1987), Argille a Palombini = Emmat Series (Manatschal & Nievergelt 1997), Emmat-Formation (Furrer et al. 2015)
Nomenclatorial Remarks
Piz d'Emmat

Description

Description

Wechsellagerung von dunklen, kieseligen Tonsteinen und Mergeln und mikritischen Kalken. Einschaltungen aus Kalkareniten sowie Brekzien mit karbonatischen Klasten.

Thickness
20-120 m in der Err-Decke, max. 30 m in der Platta-Decke (Manatschal & Nievergelt 1997).

Age

Age at top
  • Albian
Note about top

Frühe Kreide?

Age at base
  • Aptian
Note about base

Frühe Kreide?

Geography

Geographical extent
Carungas, Grevasalvas, Bardella, Nair (Err-Decke, Samedan-Zone).

Palaenography and tectonic

Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary

References

Definition
Finger Willy (1978) : Die Zone von Samaden (Unterostalpine Decken, Graubünden) und ihre jurassischen Brekzien. Mitt. geol. Inst. ETH und Univ. Zürich (N.F.) 224
Definition
Manatschal Gianreto, Nievergelt Peter (1997) : A continent-ocean transition recorded in the Err and Platta nappes (Eastern Switzerland). Eclogae geol. Helv. 90/1, 3-27

p.9: calcareous slates, dark siliceous shales and calcarenites alternating with dark grey limestones (Argille a Palombini. Emmat Series of Finger [1978], Neocomschiefer of Stöcklin [1949] or Roccabella-Schiefer of Dietrich [1970]), about 20-120 m thick in the Err nappe and up to 30 m in the Platta nappe, overlie the Radiolarite Formation. Dietrich (1969) found planktonic foraminifera (Hedbergella sp. Planomalina sp.. Schackoina sp.. questionable Globigerinoides and Clavihedbergella sp.) within the Argille a Palombini yielding an Aptian to Albian age for the youngest dated rocks in the Piatta ophiolitic sequence.
Back to top