Oberer Teil der Schrattenkalk-Formation

Back to Eastern Helvetics

Representation and status

Index
c5o
Color CMYK
(31%,0%,13%,24%)
Color RGB
R: 135 G: 195 B: 170
Rank
lithostratigraphic Member (Subformation)
Validity
Unit is in Use
Status
incorrect name (though informally used)

Nomenclature

Deutsch
Oberer Teil der Schrattenkalk-Formation
Français
Partie supérieure de la Formation du Schrattenkalk
Italiano
Parte superiore della Formazione dello Schrattenkalk
English
Upper part of the Schrattenkalk Formation
Historical Variants

Oberurgon bzw. Oberer Caprotinenkalk (Baltzer 1906), Oberer Schrattenkalk (Paulcke 1906, Schindler 1959), Unteres Aptien = oberer Schrattenkalk (Furrer 1938), Upper Schrattenkalk = upper Schrattenkalk (Föllmi et al. 2007), Upper Schrattenkalk Member (Bonvallet 2015)

Description

Description

Hellgrau anwitternder, massiger, bioklastreicher Kalk (Rudisten, Korallen, Gastropoden Muscheln und Mikrofauna).

Geomorphology
Helle Felswand.
Thickness
Max. 100 m (Föllmi et al. 2007)

Components

Fossil Content
  • rudists
  • corals
  • foraminifera

Requienia, Orbitolina lenticularis

Hierarchy and sequence

Superordinate unit

Age

Age at top
  • Early Aptian
Note about top

nahe der Grenze zwischen weissi- und deshayesi-Zone (Linder et al. 2006); Mitte des frühen Aptians

Age at base
  • Early Aptian
Note about base

Mitte des frühen Aptians 

Palaenography and tectonic

  • Middle Cretaceous
  • Cretaceous of the Helvetics
Paleogeography
North Tethyan Shelf :
marge continentale européenne
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Metamorphism
non metamorphic

References

Definition
Föllmi Karl B., Bodin Stephane, Godet Alexis, Linder Pascal, van de Schootbrugge B. (2007) : Unlocking paleo- environmental information from Early Cretaceous shelf sediments in the Helvetic Alps: stratigraphy is the key! Swiss J. Geosci. 100, 349-369

p.11: The facies of the upper Schrattenkalk is similar to that of the lower Schrattenkalk, with as main difference the frequent occurrence of small patch reefs in its upper part in the outer zone of the platform (Fig. 2; Heim 1910–1916; Oberholzer 1933; Fichter 1934; Lienert 1965; Gebhardt 1983; Bollinger 1988; Schenk 1992). These reefs are composed of corals, rudists, stromatoporoids and chaetetids and separate an inner, lagoonal environment from an outer platform margin environment (e.g. Bollinger 1988; Linder et al. 2006). This maximally 100 m thick unit shows an overall shallowing upward trend and is interpreted as the highstand systems tract of a stratigraphic sequence which started with the Rawil Member (e.g., Funk et al. 1993).
Ammonites from the overlying Grünten Member constrain the minimal age of the upper Schrattenkalk to an age near the boundary between the weissi and the deshayesi zones (Linder et al. 2006) and the deposition of this entire member is essentially limited to the weissi zone.

Back to top