Therwil-Member
Zurück zu Delémont-BeckenDarstellung und Status
- Farbe CMYK
- (0%,0%,0%,100%)
- Farbe RGB
- R: 250 G: 220 B: 130
- Rang
- lithostratigraphisches Member (Subformation)
- Gebrauch
- Element ist in Gebrauch
- Status
- gültiger formeller Begriff
Nomenklatur
- Deutsch
- Therwil-Member
- Français
- Membre de Therwil
- Italiano
- Membro di Therwil
- English
- Therwil Member
- Herkunft des Namens
- Historische Varianten
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Horizont / Bank mit Ostrea cyathula (Gutzwiller 1914, Herzog 1956, Bitterli-Brunner & Fischer 1988), Cyathulabank (Koch 1923, Bitterli 1945, Fischer 1965a, Naef et al. 1985, Picot 2002, Becker 2003, Grimm 2005, Picot et al. 2008), Therwil Member (Pirkenseer et al. 2018)
- Nomenklatorische Bemerkungen
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Un horizon à Crassostrea cyathula existe également dans le bassin de Delémont, mais dans des niveaux plus anciens (Membre des Près Roses de la Formation de Lörrach).
Beschreibung
- Mächtigkeit
- Généralement 2 m dans la région bâloise (Pirkenseer et al. 2018).
Hierarchie und Abfolge
- Übergeordnete Einheit
- Hangendes
- Liegendes
Geografie
- Geographische Verbreitung
- Partie méridionale du fossé du Haut-Rhin dans la région bâloise (Therwil, Ettingen) et extrême nord du bassin de Laufon (Brislach).
- Typusregion
- Région bâloise (BL)
Paläogeografie und Tektonik
- Paläogeografie
- Rheingraben
- Tektonische Einheit (bzw. Überbegriff)
- Herkunftstyp
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- sedimentär
Referenzen
- Erstdefinition
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(2018) :
A revised Palaeogene lithostratigraphic framework for the Northern Swiss Jura and the Southern Upper Rhine Graben and its relationship to the North Alpine Foreland Basin. Riv. Italiana Pal. Strat. 124/1, 163–246
p.214: The Therwil Mb is dominated by disarticulated valves of Crassostrea cyathula, which either form a densely packed, sometimes sandy coquina or are distributed in a matrix of mainly bluish grey, massive marls. In the area of Basel the member seems to be developed as a relatively continuous bed of maximal 2 (possibly to 5) m thickness that pinches out near Brislach (30 cm; Koch 1923) in the Laufen subbasin.
Gutzwiller (1893) indicates a continuous occurrence of the coquina bed between the villages Therwil and Ettingen (at least 4 km). Towards the north and the west the bed dissolves into oyster patch “reefs”, isolated valves in massive marls or is entirely absent (e.g. drilling Hirtzbach; Vonderschmitt 1942).