Published online by Cambridge University Press: 20 January 2017
This paper critically assesses Cottrell's model of prehistoric exchange of jasper said to have been transported through the Mojave Desert to the Tomato Springs site in coastal southern California. We point out numerous conceptual and analytical errors which cast doubt on Cottrell's interpretation of the Tomato Springs site as a control center for the importation, production, and trade of this supposedly nonlocal material. Cottrell has not demonstrated a desert origin for the jasper found at Tomato Springs, and thus has no grounds for testing any of Renfrew's distance-decay models. The presence of local natural sources of jasper better explains the occurrence of this mineral at Tomato Springs and nearby sites.