No abstract

This paper is an attempt to place the dispute about early man in South America in historical context and to review the most convincing and important evidence that has been put forward. Essentially no skeletal remains–either in North or South America–have survived recent scrutiny and direct dating by accelerator mass spectrometry (AMS) and small CO2 counters. Only a handful of North American sites still are considered likely to be pre-Clovis, but the concept of an earlier, generalized hunting-and-gathering adaptation remains popular. In South America the pre-Paleoindian sites of the 1960s and 1970s are reevaluated and found to present only weak or negative indications of early occupation. Recently discovered sites in Brazil and Chile are examined critically, and the evidence is questioned. The results of this survey and evaluation suggest that we still lack the absolutely certain case that would be necessary to support the hypothesis of glacial-age occupation. Moreover, the probability of demonstration is seen to decrease, rather than increase, as the Paleoindian horizon increasingly is defined with more certainty while only equivocal cases are marshalled for an Archaic-like pre-Paleoindian stage. In summarizing prehistory, archaeologists should depend more on unambiguous and replicated cases, rather than on regional exceptions. More interpretive caution is needed, especially where there are possibilities of mixture and secondary deposition. Natural processes often mimic cultural patterns, confusing the positive identification of informal hearths and simple artifacts.

No abstract

Harsh high-altitude environments were among the last landscapes to be settled by humans during the Late Pleistocene between ∼15,000 and 11,000 calendar years before present (cal yr BP). Successful colonization required physiological adaptations to hypoxia and cultural adaptations to limited resources and cold temperatures. How and when humans colonized Andean South America has been poorly understood owing to controversial early archaeological sites and questions about the impact of environmental factors, including the presence of glaciers. Here we report the reexamination and direct dating of six finely woven textiles and cords from Guitarrero Cave, Peru, that identify South America's earliest textiles and show that occupation of the Andes had begun by ∼12,000 cal yr BP. Additional evidence for plant processing and fiberartifact construction suggests women's presence among these earliest foraging groups. Previous research suggested use of the highlands by small groups of male foragers between 15,000 and 13,000 cal yr BP with permanent settlement only after 11,000 cal yr BP. Together these data amplify accumulating evidence for Late Pleistocene/Early Holocene technological sophistication and cultural diversity in South America and are consistent with hypotheses that long-term settlement of higher elevations occurred immediately following glacial retreat.

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