Technological and Social Strategies for the Acquisition and Exploitation of Long-Distance Lithic Raw Materials in the Central Pampean Dunefields of Argentina

The lithic raw material sources in the Pampas of Argentina present a very restricted distribution. This has generated various scenarios linked with the acquisition and conveyance of stones carried out by human groups in the past. We explore the mechanisms performed in the procurement, transport and exploitation of rocks by those hunter-gatherer societies that inhabited the Central Pampean Dunefields, an area where lithic resources are absent. The results obtained from five lithic assemblages from the Middle and Late Holocene points to a preference in the exploitation of Tandilia Hills stones through both periods, with an increase in rock diversity in the Late Holocene. Our data indicate a direct procurement of orthoquartzite and chert from Tandilia Hills, although the acquisition of the rest of the raw materials could have involved both direct and indirect procurement. These results may be related to the existence of more fluent exchange networks among Pampas hunter-gatherer groups.