Stone age etchings found in Amazon basin as river levels fall

Guardian: Brazil Stone age etchings found in Amazon basin as river levels fall Drought in Brazil reveals engravings up to 7,000 years old – evidence of ancient civilisation A series of ancient underwater etchings has been uncovered near the jungle city of Manaus, following a drought in the Brazilian Amazon. The previously submerged images – engraved on rocks and possibly up to 7,000 years old – were reportedly discovered by a fisherman after the Rio Negro, a tributary of the Amazon river, fell to......

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