A tsunami 3800 years ago devastated the coastline of Chile and encouraged hunter-gatherers to move inland, where they stayed for the next 1000 years
However, Easton and his team documented major shifts that occurred around 3800 years ago. Archaeological sites near the coast show less evidence of habitation, suggesting people stopped going there or at least spent less time there.
Furthermore, cemeteries were moved inland and uphill. The local people mummified their relatives’ bodies and placed great value on having their dead ancestors nearby – a practice that continues to this day in communities in the Andes. “The most important thing that the families and the communities had at that time were their parents,” says Easton, and they took great care to protect them.
This new pattern of behaviour lasted a long time, with many sites only being reoccupied between 1500 and 1000 years ago. “This is kind of surprising, because people usually have a short memory for this kind of event,” says Gayo. Even maintaining the behaviour for 1000 years would have meant sustaining it for 40 generations. “That is a lot.”
It isn’t clear how the memory was preserved. Easton says the message may have been passed on orally, and perhaps through pictures on stone. For Gayo, the lesson is that sometimes it is necessary to make big changes to adapt to natural hazards. That includes modern societies, which are threatened by growing climate extremes and rising seas. “You need to transform radically,” she says.
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