Table Jura
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In Switzerland, the tabular Jura refers to those parts of the Swiss Jura that, in contrast to its unfolded parts ( folded Jura ), were not folded. It is not to be confused with the Plateaujura , which forms part of the Folded Jura with the Chain Jura.
The north-eastern Table Jura stretches roughly from Pfeffingen , mainly through the cantons of Basel-Landschaft and Aargau, via areas near Sissach , Frick , Brugg and Würenlingen to the Upper Rhine with the Hohwacht east of Bad Zurzach . To the north of this, the unfolded Jura continues in the Jura ranges of Klettgaujura , Randen , Baarjura and the Swabian and Franconian Alb .
The northwestern Tabular Jura lies in the Ajoie ( Canton Jura ) and is continued in the areas of the unfolded Jura of the French layer level country .
These two Tabular Jurassic areas are separated from each other by areas of the Folded Jurassic. This stretches between Pfeffingen and Miécourt through Switzerland and the Sundgau to the Upper Rhine Graben .
The Tabular Jura can be recognized by the wide, tabular plateau-shaped plateaus consisting mainly of shell limestone , main roe stone and Malmkalk, in which steep valleys are deepened in the Basel and Aargau parts. The rock layers here were broken up into clods in the wake of the lowering of the Upper Rhine Rift from the early Tertiary. These breaks mostly run in NE to ONE directions.
The landscape of broken clods was leveled with the Miocene transgression . The marine mussel agglomerate of the Tennikerfluh lies on this transgression surface and is overlaid by the Juranagelfluh (continental erosion products of the Black Forest cover ) and Miocene marls. The Juranagelfluh was also folded. The table jura floes moved again with the Jura fold, were even folded (Adlerhof vault at HERZOG 1956), fold in the main roe stone N of Nusshof (Sissach sheet in Vorber.), Thrust in the Hauenstein base tunnel near Tecknau, Mandacher line.
Today's relief was created in the Quaternary through the activity of glaciers and rivers, which cut into the bedrock. In the calcareous formations and in the Quaternary gravel of the valley fillings, usable groundwater circulates and is used for the drinking water supply.
literature
- Tectonic map of Switzerland, ed. from the Federal Office for Water and Geology , Bern 2005
- Peter Herzog, Die Tektonik des Tafeljura and the Rheintalflexur southeast of Basel, in: Eclogae Geologicae Helvetiae , Volume 49 (1956), Issue 2, Basel 1956, pp. 317-362, with numerous profiles and a colored geological map of the area (1 : 25,000)