Eriwis-Bank
Rappresentazione e statuto
- Colore CMYK
- (13%,25%,0%,22%)
- Colore RGB
- R: 195 G: 170 B: 220
- Rango
- Strato litostratigrafico
- Uso
- Unità in uso.
- Status
- termine formale valido
Nomenclatura
- Deutsch
- Eriwis-Bank
- Français
- Banc d'Eriwis
- Italiano
- Strato di Eriwis
- English
- Eriwis Bed
- Origine del nome
-
Waldstück Eriwis, nordwestlich von Schinznach (AG)
- Varianti storiche
-
Pleydellien-Bank, Pleydellienbank, Erimis-Bank [sic] (Jordan et al. 2008), Eriwis Bed (Reisdorf et al. 2011)
Descrizione
- Descrizione
-
Einige cm dicker Kondensationshorizont der Aalensis Subzone. Bräunlich, manchmal rötliche, dunkelgraue Mergellagen, welche lateral in einen mergeligen Kalkstein übergehen können. Dieser phosphoritische, kondensierte Horizont ist charakterisiert durch die Häufigkeit an Ammoniten und Belemniten. Die Eriwis-Bank ist klar von dem darüberliegenden Opalinus-Ton abzutrennen.
- Potenza
- 0 – 0,3 m (Reisdorf et al. 2011).
Componenti
- ammoniti
Gerarchia e successione
- Unità di rango superiore
- Unità sovrastante
- Unità sottostante
- Limite superiore
-
Opalinus-Ton
- Limite inferiore
-
Die Eriwis-Bank bildet die Dachbank des Gross-Wolf-Members.
Età
- Geomorfologia
-
- Toarciano tardo
- Osservazioni sul tetto
-
Levesquei-Z., Aalensis-Sz.
- Età alla base
-
- Toarciano tardo
- Osservazioni sulla base
-
Levesquei-Z., Aalensis-Sz.
- Metodo di datazione
-
Ammoniten (Aalensis-Zone)
Geografia
- Estensione geografica
- Umgebung von Moutier bis östlicher Faltenjura.
- Regione-tipo
- Aargauer Jura
Paleogeografia e tettonica
-
- Liassico del Giura
- Paleogeografia
-
Northern Tethyan Carbonate Platform (Jura > Helv.)
:
Plateforme de Bourgogne, ... = Northern Tethyan Carbonate Platform (NTCP) - Termini generici
-
-
Jura
:
Juragebirge
-
Jura
:
- Tipo di origine
-
- sedimentaria
- Sequenza
-
Kondensationshorizont
- Metamorfismo
- non metamorfo
Referenze
- Definizione
- (2008) : Jurassic. Swiss Jura Mountains In T. McCann (Ed.), The Geology of Central Europe. Volume 2: Mesozoic and Cenozoic (pp. 880–889). London: The Geological Society of London.
- Revisione
-
(2011) :
The Staffelegg Formation: a new stratigraphic scheme for the Early Jurassic of northern Switzerland Swiss J. Geosci. 104/1, 97-146
Only a few centimetre thick, condensed horizon of the Aalensis subzone (see Etter 1990 ; Wetzel and Reisdorf 2007 ; Reisdorf et al. subm. ; cf. Etzold 1980). Occasionally brownish, sometimes reddish, dark grey marl layer which may pass laterally into a marly limestone (Figs. 11 11 , 12 , 13 , 15 16 , 17 , 18 , 23 ). This phosphoritic condensed horizon is characterised by its abundance of ammonites (especially the genera Cottes- woldia and Pleydellia , among others also C. aalensis ZIETEN 1832) and belemnites (Jordan 1983 ; Etter 1990 ; Nagra 1992 ; cf. Etzold et al. 1989 ). Based on these characteristics, the Eriwis Bed is clearly and visibly separated from the overlying Opalinus-Ton (see Jordan 1983 ; Etter 1990 ; Reisdorf 2001 ). The latter is characterised by dark grey to black, partially silty to sandy terrigenous mudstone and marl with mica (Etter 1990 ; Reisdorf 2001 ; Wetzel and Allia 2003 ). In the Schafisheim well the lithostratigraphic boundary between the Gross Wolf Member and the Opalinus-Ton is set below a 15 cm thick, reworked horizon that contains iron ooids and Mid-Jurassic foraminifera. This mudstone horizon is noteworthy because it also contains corroded ammonites of the Late Toarcian ( Cotteswoldia aalensis ZIETEN 1832; Tröster 1987 ; Nagra 1992 ).