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You are browsing the archive for 2013 June 05.

5 June 2013

Stone tools of the Piney Branch quarry, DC

Archaeology meets geology in this visit to the Piney Branch valley of Rock Creek Park in Washington, D.C. Cretaceous deposits of cobbles of Cambrian quartzite were quarried by Native Americans and modified into tools thanks to the fact that they break with a conchoidal fracture.

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