Dating methods and geomorphic evidence of palaeoenvironmental changes at the eastern margin of the South Peruvian coastal desert (14°30′S) before and during the Little Ice Age

Luminescence dating of glacial deposits near the eastern Himalayan syntaxis using different grain-size fractions

“…For 18 samples, the MG quartz CAM ages are significantly older (ratios >1.2) than the corresponding FG quartz OSL ages, implying that the finer grains may have been more thoroughly bleached prior to burial. This is contrary to results from previous investigations of different grain-size fractions within fluvial sediments (Kadereit et al, 2006;Unkel et al, 2007;Vandenberghe et al, 2007;Hu et al, 2010;Zhang et al, 2010a, b;Shen and Mauz, 2012) and glaciofluvial sediments (Richards et al, 2000a, b;Preusser et al, 2001Preusser et al, , 2003Alexanderson, 2007) which a C, M and F in brackets represent coarse, medium and fine sand. b Skew (c) and standard error (s c ) were calculated using the formula of Bailey and Arnold (2006).…”

Pilgrimage as costly signal: Religiously motivated cooperation in Chaco and Nasca

“…Up until recently, archaeologists working in the region have relied on ice-core data from the central Andes (Shimada et al, 1991) and have sometimes resorted to indirect evidence focused on settlement pattern data (e.g., Lancho Rojas, 1995, 2003). Several years ago, however, a reconstruction based on the analysis of loess deposits that serve as proxies for more humid conditions gave archaeologists a paleoclimatic record of the last 10,000 years on the south coast (Table 3; Eitel et al, 2005;Unkel et al, 2007), while a just-published authigenic calcite record from a varved lake in the central Andes provides a nearly annually resolved climate record ( Fig. 5 and Table 3; Bird et al, 2011).…”

Distinctiveness and Diversity of Arid Zone River Systems

“…Although information is sparse for some of these regions, descriptions of bedrock gorges and coarse-grained alluvial rivers in the American southwest, Middle East and South America (e.g. Graf, 1988;Wells, 1990;McLaren et al, 2004;Hoke et al, 2004;Unkel et al, 2007;Magilligan et al, 2008) reveal morphological and sedimentological similarities with some Mediterranean and southern African rivers. Inland deltas in north Africa (e.g.…”