1 Reactivation of the Pleistocene trans-Arabian Wadi ad 2 Dawasir fluvial system (Saudi Arabia) during the 3 Holocene humid phase 4 5 Albert Matter a, Ayman Mahjoub b, Eike Neubert c, Frank Preusser d,e *, Antje Schwalb f, Sönke Szidat g, 6 Gerwin Wulf e 7 8 a Institute of Geological Sciences, University of Bern, Balterzerstrasse 1+3, 3012 Bern, Switzerland 9 b Saudi Geological Survey, P.O.Box 54141, Jeddah 21514, Kingdom of Saudi Arabia 10 c Natural History Museum Bern, Bernastrasse 15, 3005 Bern, Switzerland 11 d Previously at: Department of Physical Geography and Quaternary Geology, Stockholm University, 10690 Stockholm, Sweden 12 e Institute of Earth and Environmental Sciences, University of Freiburg, Albertstraße 23b, 79104 Freiburg, Germany 13 f Institut für Geosysteme und Bioindikation, Technische Universität Braunschweig, 38106 Braunschweig, Germany 14 g Department of Chemistry and Biochemistry & Oeschger Centre for Climate Change Research, University of Bern, Freiestrasse 3, 15 3012 Bern, Switzerland 16 *corresponding author. E-mail:
[email protected] 17 18 19 Accepted version 20 21 Published in 22 Geomorphology 270 (2016) 88–101 23 http://dx.doi.org/10.1016/j.geomorph.2016.07.013 24 | downloaded: 6.1.2020 https://doi.org/10.7892/boris.85894 source: 1 25 Abstract – The Wadi ad Dawasir fluvial system in central Saudi Arabia is investigated using 26 remote sensing and sedimentology, in combination with bio-proxy analyses (molluscs and 27 ostracods). Age control is provided by radiocarbon as well as luminescence dating, using both 28 quartz and feldspar grains. It is shown that the fluvial system was active from the Asir 29 Mountains across the partially sand-covered interior of the Arabian Peninsula to the Arabian 30 Gulf during the Holocene humid period.