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Fredrik Molin sent it to me. He's a field archaeologist and Mesolithic scholar working in Östergötland. Together with Magnus Rolöf and other colleagues, he's excavated a Stone Age quartz quarry at Stjärneberg right outside Linköping.
As mentioned here before, quartz is a tricky material to knap, not at all like flint. You get loads of debris, and your actual products are pretty ugly. But it works, and in much of Scandinavia quartz was the number one tool-making material for millennia.
At Stjärneberg Fredrik and the others have documented a small quarry looking pretty much like it did on the last day that somebody used it. The date of use is still uncertain, and the site may have seen repeated visits for centuries or millennia. But there was a knapping floor nearby displaying a bipolar knapping technique particularly common during the Mesolithic, and post-glacial shoreline displacement sets the earliest possible date for the quarry's use to the Late 7th Millennium BC. This is the date that Fredrik suggests: at the time, the site was at the shore of an island with good access to marine resources. Hopefully, radiocarbon from a nearby hearth will settle the issue.
Molin, Fredrik; Rolöf, Magnus & Wikell, Roger. Manuscript. Mesolithic quartz quarrying in Eastern Middle Sweden in the light of a newly excavated quarry at Stjärneberg, Linköping.
[More blog entries about archaeology, Mesolithic, lithics, Sweden; stenåldern, mesolitikum, stensmide, arkeologi, Östergötland.]