Luminescence dating and archaeology of Holocene fluvio-lacustrine sediments of Abu Tartur, Eastern Sahara

The paleolithic site of Longwangchan in the middle Yellow River, China: chronology, paleoenvironment and implications

“…Valladas et al, 2003;Gillespie and Brook, 2006), or provides the dates which may not reflect the deposition age of the sediments due to mobilization or re-deposition of older charcoal (e.g. Blong and Gillespie, 1978;El-Daoushy and Eriksson, 1998;Bubenzer et al, 2007). The above discussion suggests that it is very important to confirm the validity of radiocarbon dates of charcoal obtained for a site by comparing with other independent age controls.…”

Optical ages indicate the southwestern margin of the Green Bay Lobe in Wisconsin, USA, was at its maximum extent until about 18,500years ago

“…Instead, we attribute these problems to inaccurately estimating the environmental dose rates, a conclusion we base in part on the more consistent results we had from the Feltz and South Bluff sites where sediments were more homogeneous. The environmental dose rate can be difficult to accurately characterize in heterogeneous sediments (Bubenzer et al, 2007). In Feltz and South Bluff basins, lacustrine sediment was dominantly homogeneous fine to medium sand (Fig.…”

The use of new elevation data (SRTM/ASTER) for the detection and morphometric quantification of Pleistocene megadunes (draa) in the eastern Sahara and the southern Namib

“…During the Holocene humid phase or humid optimum (c. 10-7 ka cal BP, Haynes, 1982;de Menocal, 2000;Gehlen et al, 2002;Linstädter and Kröpelin, 2004;Kuper, 2006;Bubenzer and Riemer, 2007), runoff after annual precipitation amounts of 50-100 mm and intermediate short deflation phases (Bubenzer and Hilgers, 2003;Bubenzer et al, 2007b) shaped the draa into the present whalebacks (after Bagnold, 1941Bagnold, , 1953. Runoff from the slightly consolidated draa surfaces and seepage at their bases supplied water for shallow episodic or seasonal ponds and lakes in shallow depressions of the interdraa corridors, where playa sediments were deposited (comp.…”