It happens: Archaeologists discover ancient livestock fecal matter in Azores’ lake sediment which reveals Norse explorers stepped foot on the islands 700 years before the Portuguese 

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The stigmastanols attributed to cows and goats were found in sediment layers dated to between 700 and 850 AD.Because of their isolation in the middle of

Source: It happens: Archaeologists discover ancient livestock fecal matter in Azores’ lake sediment which reveals Norse explorers stepped foot on the islands 700 years before the Portuguese