EGU2020-7445, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-7445
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Environmental changes in the Wehntal Valley in Northern Switzerland

Johannes Miocic1, Ruth Drescher-Schneider2, Hans Rudolf Graf3, Marlu Kühn4, Frank Preusser1, Werner H. Schoch5, Nigel Thew6, Lucia Wick4, and Heinz Furrer7
Johannes Miocic et al.
  • 1Institute of Earth and Environmental Sciences, Albert-Ludwigs-Universität Freiburg, Albertstr. 23b, 79104 Freiburg, Germany
  • 2Schilingsdorfer Straße 27, 8010 Kainbach bei Graz, Austria
  • 3Dr. von Moos AG, Bachofnerstrasse 5, 8037 Zürich, Switzerland
  • 4Integrative Prähistorische und Naturwissenschaftliche Archäologie, Universität Basel, 4055 Basel, Switzerland
  • 5Labor für Quartaere Hoelzer/ Laboratory for Ancient Wood Research, Unterrütistrasse 17, 8135 Langnau a.A., Switzerland
  • 6Rue Paul Bouvier 2, 2000 Neuchâtel, Switzerland
  • 7Paläontologisches Institut und Museum Universität Zürich, 8006 Zürich, Switzerland

Quaternary deposits within the glacially overdeepened trough of the Wehntal Valley in Northern Switzerland, record glacial and interglacial conditions from the Beringen Glaciation (MIS 6) through to the Holocene. The area is well known for the Niederweningen site, with its rich Late Pleistocene mammal remains found in a buried peat deposit. In addition to this famous “mammoth peat”, more deeply buried peat layers, part of which have previously been attributed to the final part of the Last Interglacial, also include a wealth of environmental data.

Here, we present the first results of an investigation, including sedimentology, geochemistry, palaeobotany (pollen, wood and plant macroremains), malacology, and luminescence dating, of two 16 meter drill cores taken close to the Niederweningen site. The analysed sedimentary successions in both cores show a transition from a series of laminated silts typical of a lake environment to a several meter-thick succession of well-developed organic silts, tufaceous silts and peat layers characteristic of near shore and shore conditions. The presence of dropstones and a lack of organic material in the lower part of the lake sediments indicate glacial conditions, while the peat-rich succession formed during a relatively warm period followed by a time of fluctuating climate. Preliminary results indicate that the organic-rich units represent the Last Interglacial, followed by warm interstadials during the early part of the Last Glacial period. The "mammoth peat" appears to be missing from the studied cores. Erosive surfaces within the peaty succession impede a straightforward interpretation.

How to cite: Miocic, J., Drescher-Schneider, R., Graf, H. R., Kühn, M., Preusser, F., Schoch, W. H., Thew, N., Wick, L., and Furrer, H.: Environmental changes in the Wehntal Valley in Northern Switzerland , EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-7445, https://doi.org/10.5194/egusphere-egu2020-7445, 2020

Displays

Display file

Comments on the display

AC: Author Comment | CC: Community Comment | Report abuse

displays version 1 – uploaded on 03 May 2020, no comments