Early Holocene coca chewing in northern Peru

@article{Dillehay2010EarlyHC,
  title={Early Holocene coca chewing in northern Peru},
  author={Tom D Dillehay and Jack Rossen and Donald Ugent and Anathasios Karathanasis and V{\'i}ctor V{\'a}squez and Patricia J. Netherly},
  journal={Antiquity},
  year={2010},
  volume={84},
  pages={939 - 953}
}
Chewing coca in South America began by at least 8000 cal BP: our authors found and identified coca leaves of that date in house floors in the Nanchoc Valley, Peru. There were also pieces of calcite — which is used by chewers to bring out the alkaloids from the leaves. Excavation and chemical analysis at a group of neighbouring sites suggests that specialists were beginning to extract and supply lime or calcite, and by association coca, as a community activity at about the same time as… 

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