"A new technique which dates obsidian — volcanic glass which can be
fashioned into tools — suggests that people were mining for obsidian
in Mediterranean waters and shipping the once valuable rocks from the
island of Melos in modern day Greece as far back as 15,000 years
ago."
http://www.pasthorizonspr.com/index.php/archives/08/2011/obsidian-artifacts-point-to-ice-age-mariners-in-prehistoric-greece
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