Traces of coca leaves found in northern Peru dates the communal chewing of coca with lime (the alkaline mineral, not the citrus fruit) 8000 years back. Other evidence of coca traces have been found in mummies dating 3000 years back in northern Chile. Beginning with the Valdivian culture, circa 3000 BC, there is an unbroken record of coca leaf consumption by succeeding cultural groups on the coast of Ecuador until European arrival as shown in their ceramic sculpture and abundant caleros or lime pots. Lime containers found in the north coast of Peru date around 2000 BC as evidenced by the findings at Huaca Prieta and the Jetetepeque river valley. Extensive archaeological evidence for the chewing of coca leaves dates back at least to the 6th century AD Moche period, and the subsequent Inca period, based on mummies found with a supply of coca leaves, pottery depicting the characteristic cheek bulge of a coca chewer, spatulas for extracting alkali and figured bags for coca leaves and lime made from precious metals, and gold representations of coca in special gardens of the Inca in Cuzco.