We have every reason to believe that pre-Inca inhabitants of Peru were familiar with Coca up to 20,000 years ago.
The most ancient evidence yet found is a ceramic fragment from the Valdivia culture which represents a face with a lump in the cheek. It was found on the coast between Ecuador and Peru, and dates back to 3000BC.
Similar pieces have been found in upper valleys in Peru and may have been in use around 2000BC.
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