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An extreme drought in parts of the Amazon has led to a dramatic drop in river water levels, exposing dozens of usually submerged rock formations with carvings of human forms that may date back some 2,000 years.
The surfacing of the engravings on the riverbank have delighted scientists and the general public alike but also raised unsettling questions. According to experts, the dry season has worsened this year due to El Nino, an irregular climate pattern over the Pacific Ocean that disrupts normal weather, adding to the effect ofThe engravings comprise an archaeological site of"great relevance," said Jaime Oliveira of the Brazilian Institute of Historical Heritage .They are at a site known as Praia das Lajes and were first seen in 2010, during another period of drought not as severe as the current one.
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