Silver Lake is the modern terminal playa of the Mojave River in southern California (USA). As a result, it is well located to record both influences from the winter precipitation dominated San Bernardino Mountains – the source of the Mojave River – and from the late summer to early fall North American monsoon at Silver Lake. Here, we present various physical, chemical and biological data from a new radiocarbon-dated, 8.2 m sediment core taken from Silver Lake that spans modern through 14.8 cal ka BP. Texturally, the core varies between sandy clay, clayey sand, and sand-silt-clay, often with abrupt sedimentological transitions. These grain-size changes are used to divide the core into six lake status intervals over the past 14.8 cal ka BP. Notable intervals include a dry Younger Dryas chronozone, a wet early Holocene terminating 7.8 – 7.4 cal ka BP, a distinct mid-Holocene arid interval, and a late Holocene return to ephemeral lake conditions. A comparison to potential climatic forcings implicates a combination of changing summer – winter insolation and tropical and N Pacific sea-surface temperature dynamics as the primary drivers of Holocene climate in the central Mojave Desert.

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Immunological analysis of blood residues was performed on 25 lithic artifacts from two archaeological sites (DEL-166 and DEL-168) in the De Long Mountains of northwestern Alaska. Blood residues occur on five artifact types: retouched flakes; end scrapers; flake burins; bifaces; and wedge-shaped microblade cores. Fourteen (56%) of the 25 analyzed artifacts react positively to six animal antisera and to human blood. Besides human blood, identified residues include the blood of sturgeon (Acipenseridae), deer (Cervidae), rabbit (Leporidae), bear (Ursus), "cat" (Felidae) and "mouse" (Rodentia). Although the application of blood residue analysis to archaeological problems is a relatively new application of an old forensic method, it may provide useful information about artifact function and animal procurement from sites where faunal remains are not preserved.

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AbstractUsing lithic and faunal data from 33 Cody complex (10,000–860014C years B.P.) components from the northern Great Plains, this study explores how Paleoindian land use and foraging strategies varied in relation to resource structure at the regional scale. The analysis of regional-scale faunal and lithic data was undertaken to demonstrate how disparate but related datasets must be considered together to develop a more complete understanding of hunter-gatherer lifeways. Empirical observations from the Cody archaeological record were compared to an optimal foraging theory and temporal resource predictability theory-inspired land-use model. The model predicts, and the data support, a pattern whereby Cody groups in the resource-rich foothill-mountain zone employed a regionally restricted land-use strategy for a protracted portion of the year, made spatially limited movements during which they relied on local toolstone, and expanded diet breadth by hunting a mixture of dispersed bison herds and small-bodied animals. In the comparatively resource-poor plains grasslands and adjacent alluvial valleys, the model predicts and the data indicate that Cody groups employed a nonregionally restricted land-use strategy in which they rapidly moved through regions, relied on nonlocal toolstone sources, made many residential moves over vast areas, and relied on a narrow range ofbiotic resources (primarily bison).

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