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Lapis Lazuli, The Blue Road: Seeking the sources of the longest trade

Establishing the origin of the lapis lazuli used in ancient artefacts has long been beyond the reach of science. Now an innovative technique has revealed, in a non-invasive way, where the precious stone was coming from. Alessandro Lo Giudice, Alessandro Re, Laura Guidorzi, Marta Magalini, Norman Hammond, Randall Law, Guy Clutterbuck, and Georgina Herrmann guide us from a laboratory in Italy to a remote mine.

ABOVE The location of Cedrocucho. This photograph shows the steep sided and heavily vegetated mountain where ruins were recently encountered during forest clearance work (location circled in red). BELOW This 1m wide wall seems to mark the lower eastern boundary of the site. At one end, it connects to a cliff, while at the other it reportedly reaches a ravine.

Cedrocucho: a pre-Inca tropical rainforest site?

The Incas had an eye for exotic rainforest produce, but many questions remain about how and when such goods were exploited by peoples living in the Peruvian highlands. Now a major archaeological complex, discovered during deforestation, promises to shed new light on the subject. Lidio M Valdez ponders who was farming the forest.