Plants help detect old ruins
Fascinating post on Bldg Blog on how chemical analysis of plants can point to buried ruins:
"The brief article goes on to tell the story of two archaeologists, who,
in collecting plants in Greenland, made the chemical discovery: 'Some of
their samples were unusually rich in nitrogen-15, and subsequent digs
revealed that these plants had been growing above long-abandoned Norse
farmsteads.'"
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