caa a22 4500 445839406 CHVBK 20180317145339.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00015-011-0088-7 doi (NATIONALLICENCE)springer-10.1007/s00015-011-0088-7 Post-depositional impacts on ‘Findlinge' (erratic boulders) and their implications for surface-exposure dating [Elektronische Daten] [Naki Akçar, Susan Ivy-Ochs, Peter Kubik, Christian Schlüchter] Understanding and interpretation of ‘numbers' produced about the depositional age of an erratic boulder by cosmogenic nuclide surface-exposure dating is important in the construction of glacial chronology. We have sampled three ‘Findlinge' (glacially transported boulders) located on the right-lateral margin of the Aare glacier at Möschberg, Grosshöchstetten, southeast of Bern, with the aim of shedding light on this topic. The boulders have the same depositional, but different post-depositional histories: simple exposure; exhumation; and human impact. This sampling is specially selected for this study, since the boulders showing exhumation and human impact would not have been sampled in a regular surface-exposure dating application. We measured cosmogenic 10Be concentrations and calculated apparent exposure ages that are 13.6±0.5, 18.1±0.8, and 7.5±0.4ka, respectively. The exposure age of the first boulder reflects exhumation. The apparent exposure age of 18.1±0.8ka (erosion-corrected exposure age 19.0±0.9ka) from the second boulder correlates well with the end of the Alpine and global last glacial maximum. The third boulder shows evidence of quarrying as it is surrounded by a rim of excavation material, which is also reflected by the 7.5±0.4ka apparent exposure age. We modeled the variation of 10Be concentrations with depth down into the sediment in which the first (exhumed) boulder was once buried in, and down into the third (quarried) boulder. According to our modeling, we determined that the exhumed ‘Findling' was buried in sediment at a depth of around 0.5m, and around 2m of rock was quarried from the third ‘Findling'. Our results reveal the importance of sampling for surface-exposure dating within a well defined field context, as post-depositional impacts can easily hinder exposure-dating of surfaces. Swiss Geological Society, 2011 Cosmogenic 10Be nationallicence Findling nationallicence Inheritance nationallicence Exhumation nationallicence Human impact nationallicence Alpine Foreland nationallicence Akçar Naki Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland aut Ivy-Ochs Susan Institute of Particle Physics, ETH Hönggerberg, 8093, Zurich, Switzerland aut Kubik Peter Institute of Particle Physics, ETH Hönggerberg, 8093, Zurich, Switzerland aut Schlüchter Christian Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland aut Swiss Journal of Geosciences SP Birkhäuser Verlag Basel 104/3(2011-12-01), 445-453 1661-8726 104:3<445 2011 104 15 https://doi.org/10.1007/s00015-011-0088-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00015-011-0088-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Akçar Naki Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland aut NATIONALLICENCE 700 1- Ivy-Ochs Susan Institute of Particle Physics, ETH Hönggerberg, 8093, Zurich, Switzerland aut NATIONALLICENCE 700 1- Kubik Peter Institute of Particle Physics, ETH Hönggerberg, 8093, Zurich, Switzerland aut NATIONALLICENCE 700 1- Schlüchter Christian Institute of Geological Sciences, University of Bern, Baltzerstrasse 1-3, 3012, Bern, Switzerland aut NATIONALLICENCE 773 0- Swiss Journal of Geosciences SP Birkhäuser Verlag Basel 104/3(2011-12-01), 445-453 1661-8726 104:3<445 2011 104 15 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer