Cody Complex foragers and their use of grooved abraders in Great Plains and Rocky Mountains of North America

Comparison of Late Paleoindian sites of the Great Plains and Rocky Mountains reveals 36 site components from 28 sites containing ground stone tools, including nine Cody Complex examples. Much of the ground stone use appears related to generalized activity, as few items have functionally specific forms. However, the Cody components have an unexpectedly higher number of grooved abraders as compared to other complexes. We note that Paleoindian examples contain wider u-shaped grooves compared to Late Prehistoric/Protohistoric abraders related to arrow production. We argue that Paleoindian abraders represent shaft abraders, used in the production of dart shafts within weaponry systems. We propose several hypotheses for the emergence of this technology during Cody times. The most parsimonious explanation is that the specific sites containing these abraders represent large camps, occupied for long periods and containing diverse chipped and ground stone assemblages.

Linking Bones and Stones: Regional Variation in Late Paleoindian Cody Complex Land Use and Foraging Strategies

Using 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).