Kaiseraugst-Formation

Représentation et statut

Index

tKa [mu1]

Couleur CMYK

10 / 40 / 75 / 0

Couleur RGB

R: 225 G: 160 B: 80

Rang

Formation lithostratigraphique

Usage

Ce terme est en usage.

Status

terme formel valide

Scs Note

Name und Konzept genehmigt.

Scs Date

22.11.2014

Discussion du statut

Nomenclature

Deutsch

Kaiseraugst-Formation

Français

Formation de Kaiseraugst

Italiano

Formazione di Kaiseraugst

English

Kaiseraugst Formation

Origine du nom

Rheinufer bei Kaiseraugst (AG)

Variantes historiques

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

Remarques nomenclatoriales

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.

Épaisseur

5 - 60 m (Jordan 2016)

Composants

• mica

bituminös

• ammonites
• gastéropodes
• échinodermes
• brachiopodes
• bivalves

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

Hiérarchie et succession

Unités hiérarchiquement subordonnées

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

Unités sus-jacentes

• Zeglingen-Formation (Anhydritgruppe)

Unités sous-jacentes

• Dinkelberg-Formation

Limite supérieure

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

Limite inférieure

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

Âge

Âge au sommet

• Anisien

Âge à la base

• Anisien

Méthode de datation

Siehe Hagdorn & Simon 2005, Geyer et al. 2011

Géographie

Extension géographique

Nordschweiz, ausser Bodensee-Gebiet.

Région-type

Unteres Hochrhein-Gebiet zwischen Basel und Schwaderloch (AG)

Localité-type

• Kaiseraugst (AG)
  Particularités du site
  • typische Fazies
  Accessibilité du site
  • Bachprofil
  • unzugängliches Gelände
  Coordonnées
  • (2621500 / 1265770)
  Note
  • Rheinufer (beidseitig) (Disler 1914 Profile VI-VIII ; Jordan 2016)

Typusprofil

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

Coupes de référence

• Kaisten (AG)
  Particularités du site
  • Obergrenze
  • Untergrenze
  Accessibilité du site
  • Bohrkern
  Coordonnées
  • (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)
  Particularités du site
  • Obergrenze
  Accessibilité du site
  • Bohrkern
  Coordonnées
  • (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

Paléogéographie et tectonique

• Trias du Jura
• Trias moyen

Paléogéographie

Fossé rhénan

Termes génériques

• Jura :
  Juragebirge

Type de protolithe

• sédimentaire

Conditions de 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).

Séquence

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).

Métamorphisme

non métamorphique

Références

Définition

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.

Principales 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

Matériel et divers

gelb, grünlich

15200139