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.