Palaeomagnetic and mineral magnetic analyses of the Deckenschotter of northern Switzerland and southern Germany

Scheidt, Stephanie; Buechi, Marius W.; Egli, Ramon; Biedermann, Andrea R.; Deplazes, Gaudenz (2023). Palaeomagnetic and mineral magnetic analyses of the Deckenschotter of northern Switzerland and southern Germany. Swiss journal of geosciences, 116(1) Springer 10.1186/s00015-023-00439-y

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The Deckenschotter is a fluvial to glaciofluvial gravel unit in northern Switzerland and southern Germany. The deposits are considered the oldest preserved glacial to interglacial Quaternary deposits in the northern Alpine foreland and are thus important geomorphological markers for landscape evolution. Nevertheless, the age of the deposits is only approximately known and subject to controversial debates. This study presents the results of an extensive palaeomagnetic investigation carried out on intercalated fine-grained sediments at 11 sites of the Höhere Deckenschotter (HDS) and at 5 sites of the Tiefere Deckenschotter (TDS). The HDS show reversed and normal magnetisations, indicating deposition > 0.773 Ma, while the TDS exhibit only normal directions. Age constraints for the different sites are discussed in the light of evidence from other studies. The study therefore clearly supports the efforts to determine the age of the Deckenschotter. As data from previous palaeomagnetic studies on the HDS and TDS have not been published or preserved, this is in fact the only data-based palaeomagnetic study available.

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