Oberer Teil der Schrattenkalk-Formation

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, Staeger 1944, 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

• rudists
• corals
• foraminifera

Requienia, Orbitolina lenticularis

Hierarchy and sequence

Superordinate unit

• Schrattenkalk-Formation

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)

• Drusberg

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.