Kaiseraugst-Formation

Representation and status

Index

tKa [mu1]

Color CMYK

10 / 40 / 75 / 0

Color RGB

R: 225 G: 160 B: 80

Rank

lithostratigraphic Formation

Validity

Unit is in Use

Status

valid formal name

Scs Note

Name und Konzept genehmigt.

Scs Date

22.11.2014

Status discussion

Nomenclature

Deutsch

Kaiseraugst-Formation

Français

Formation de Kaiseraugst

Italiano

Formazione di Kaiseraugst

English

Kaiseraugst Formation

Origin of the Name

Rheinufer bei Kaiseraugst (AG)

Historical Variants

«Unterer Muschelkalk» auct., «Wellengebirge» auct., Kaiseraugst-Formation (Jordan 2016)

Nomenclatorial Remarks

The Kaiseraugst Formation corresponds to the «Wellengebirge» as it was interpreted in the Swiss stratigraphic scheme (e.g. Mu¨ ller et al. 1984, see also Fig. 3). It includes the basal «Wellendolomit», the «Wellenkalk» or «Wellenmergel», and the «Orbicularismergel» on top. In Germany, all three units are considered as own formations whereby the uppermost Karlstadt Formation is part of the Middle Muschelkalk Subgroup while the other two, Freudenstadt Formation and Jena Formation, form the Lower Muschelkalk Subgroup (Hagdorn and Simon 2005).

Description

Description

Dolomit, Kalkstein, Mergel und Tone, oft reich an Invertebraten Fossilien, typischerweise Rippelmarken und z.T. bituminös.

Thickness

5 - 60 m (Jordan 2016)

Components

• mica

bituminös

• ammonites
• gastropods
• echinoderms
• brachiopods
• bivalves

Fossilführend: Ceratiten (Beneckeia buchi), Nautiliden, Neoschizodus (ex Myophoria) orbicularis.

Hierarchy and sequence

Subordinate units

• «Orbicularis-Mergel»
• Wellenkalk / Wellenmergel
• Wellendolomit

Units at roof

• Zeglingen-Formation (Anhydritgruppe)

Units at floor

• Dinkelberg-Formation

Upper boundary

Stratigraphischer Kontakt zur Zeglingen-Fm.: Einsetzen der evaporitischen Fazies (oftmal mit massiver basalen Anhydritbank) und der Corrensite bei der Ton-Mineralogie.

Lower boundary

Nicht konformer, transgressiver, stratigraphischer Kontakt zur Dinkelberg-Fm.

Age

Age at top

• Anisian

Age at base

• Anisian

Dating Method

Siehe Hagdorn & Simon 2005, Geyer et al. 2011

Geography

Geographical extent

Nordschweiz, ausser Bodensee-Gebiet.

Type area

Unteres Hochrhein-Gebiet zwischen Basel und Schwaderloch (AG)

Type locality

• Kaiseraugst (AG)
  Site particularities
  • typische Fazies
  Site accessibility
  • Bachprofil
  • unzugängliches Gelände
  Coordinates
  • (2621500 / 1265770)
  Note
  • Rheinufer (beidseitig) (Disler 1914 Profile VI-VIII ; Jordan 2016)

Type profile

• Warmbach (Deutschland)
  Site particularities
  • typische Fazies
  Site accessibility
  • Bachprofil
  • unzugängliches Gelände
  Coordinates
  • (2622750 / 1266000)
  Note
  • Rechtes Rheinufer (Disler 1914 Profil VII ; Jordan 2016)
• Junkholz (AG)
  Site particularities
  • typische Fazies
  Site accessibility
  • Bachprofil
  • unzugängliches Gelände
  Coordinates
  • (2622800 / 1265775)
  Note
  • Linkes Rheinufer (Disler 1914 Profil VIII ; Jordan 2016)
• Augarten (AG)
  Site particularities
  • typische Fazies
  Site accessibility
  • Bachprofil
  • unzugängliches Gelände
  Coordinates
  • (2623640 / 1265975)
  Note
  • Linkes Rheinufer (Disler 1914 Profile VI ; Jordan 2016) ; z.T. überflutet

Reference profiles

• Kaisten (AG)
  Site particularities
  • Obergrenze
  • Untergrenze
  Site accessibility
  • Bohrkern
  Coordinates
  • (2644642 / 1265624)
  Note
  • Drilling metre 46.40–94.00 (Peters et al. 1989): not fully cored and some core losses; but base and top—in a close to bedrock surface situation—are preserved. Nagra core store facility

Point of interest

• Riniken (AG)
  Site particularities
  • Obergrenze
  Site accessibility
  • Bohrkern
  Coordinates
  • (2656605 / 1261780)
  Note
  • The transition from the overlying Schinznach Formation to the Kaiseraugst Formation (extending from drilling metre 749.44–793.90) is fully cored, but the rest of the formation is not cored. Nagra core store facility

Palaenography and tectonic

• Triassic of the Jura Mountains
• Middle Triassic

Paleogeography

Rhine Graben

Tectonic unit (resp. main category)

• Jura :
  Juragebirge

Kind of protolith

• sedimentary

Conditions of formation

The sequence documents the build-up of a connection between the northern Central European Basin (Germanic Basin) and the Tethys Ocean. This marine strait follows a proto-Rhenish depression (Hagdorn & Nitsch 2009).

Sequence

The sequence documents the setting up of a connection between the northern Central European Basin and the Tethys ocean. The NNE to SEE tending axis of this ‘‘Swabian seaway’’ can be localized east of today Black Forest reaching Northern Switzerland in the Schaffhausen area. It is charcterized by the domination of limestone facies during the maximum flooding while in lateral domains dolomite and siliclastic intercalations are more abundant (Hagorn and Nitsch 2009).

Metamorphism

non metamorphic

References

Definition

Jordan Peter (2016) : Reorganisation of the Triassic stratigraphic nomenclature of northern Switzerland: overview and the new Dinkelberg, Kaiseraugst and Zeglingen formations. Swiss J. Geosci. 109/2, 241-255

Dolomite, (crinoidal) limestone, marl and shale, often rich in marine invertebrate fossils. Some levels contain galenite, sphalerite, chalcopyrite etc. (Hofmann 1985; Hofmann et al. 2000). In some levels, ripple marks are found. Horizons with dolocretes, desiccation cracks and roots document periods of emergence.

In general, the sedimentary succession starts with a transgressive sequence including partly sandy dolomite in alternation with dolomitic marl. The high stand is documented by an alternation of marl and subordinate limestone. The succession ends with bituminous shale. The overall transgressive–regressive cycle is superimposed by different subcycles (e.g. Götz 2002).

The fossil record includes cephalopods (ceratitida as Beneckeia buchi and nautilids), bivalves, gastropods, brachiopods, echinoderms. A typical fossil in the bituminous upper part is the bivalve Neoschizodus orbicularis (Myophoria orbicularis in old literature). See Disler (1914) for a comprehensive fossil list.

Important Publications

Jordan Peter (2016) : Reorganisation of the Triassic stratigraphic nomenclature of northern Switzerland: overview and the new Dinkelberg, Kaiseraugst and Zeglingen formations. Swiss J. Geosci. 109/2, 241-255

Disler Carl (1914) : Stratigraphie und Tektonik des Rotliegenden und der Trias beiderseits des Rheins zwischen Rheinfelden und Augst. Verhandlungen der Naturforschenden Gesellschaft in Basel 25, 1-96

Material and varia

gelb, grünlich

15200139