Articles | Volume 4, issue 2
https://doi.org/10.5194/gchron-4-691-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-4-691-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Technical note: Evaluating a geographical information system (GIS)-based approach for determining topographic shielding factors in cosmic-ray exposure dating
Felix Martin Hofmann
CORRESPONDING AUTHOR
Institute of Earth and Environmental Sciences, University of Freiburg,
Freiburg, 79104, Germany
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Previous reconstructions conclude that the southern Black Forest, south-west Germany, temporarily hosted four ice caps during the Late Pleistocene (129 000–11 700 years before present). This work reviews existing studies on glacial landforms north-east of its highest summit, Feldberg (1493 m above sea level), in the light of new observations. Whilst this study largely confirms previous work, we reject and newly describe several glacial landforms.
Alexander Fülling, Hans Rudolf Graf, Felix Martin Hofmann, Daniela Mueller, and Frank Preusser
E&G Quaternary Sci. J., 73, 203–216, https://doi.org/10.5194/egqsj-73-203-2024, https://doi.org/10.5194/egqsj-73-203-2024, 2024
Short summary
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The Mühlbach series has been given as evidence for a Late Pliocene/Early Pleistocene Aare–Rhine fluvial system in northern Switzerland and southwest Germany. We show that these deposits represent a variety of different units. At the type location, luminescence dating indicates an age of 55 ka, and we interpret the deposits as slope reworking. Beside methodological implications, our studies recommend caution regarding the interpretation of stratigraphic units for which limited data are available.
Felix Martin Hofmann, Claire Rambeau, Lukas Gegg, Melanie Schulz, Martin Steiner, Alexander Fülling, Laëtitia Léanni, Frank Preusser, and ASTER Team
Geochronology, 6, 147–174, https://doi.org/10.5194/gchron-6-147-2024, https://doi.org/10.5194/gchron-6-147-2024, 2024
Short summary
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We determined 10Be concentrations in moraine boulder surfaces in the southern Black Forest, SW Germany. We applied three independent dating methods to younger lake sediments. With the aid of independent age datasets, we calculated the growth of 10Be concentrations in moraine boulder surfaces.
Felix Martin Hofmann
E&G Quaternary Sci. J., 72, 235–237, https://doi.org/10.5194/egqsj-72-235-2023, https://doi.org/10.5194/egqsj-72-235-2023, 2023
Short summary
Short summary
This study aims to reconstruct the last glaciation of the southern Black Forest. Ice-marginal positions in this region were, for the first time, directly dated. Glacier retreat from the last glaciation maximum position was probably underway no later than 21 ka. Re-advances and/or standstills of glaciers (no later than 17–16 ka, 15–14 ka and 13 ka) punctuated the subsequent trend towards ice-free conditions.
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Short summary
If topographical obstructions are present in the surroundings of sampling sites, exposure ages of rock surfaces need to be corrected. A toolbox for the ESRI ArcGIS software allows for quantifying topographic shielding with a digital elevation model, but it has only been validated with few field data. In this study, the output of the toolbox is evaluated with a more extensive dataset. If suitable elevation data are chosen, the toolbox provides a sound approach to determine topographic shielding.
If topographical obstructions are present in the surroundings of sampling sites, exposure ages...