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03-03-2012, 05:56 PM #24
Correct me if I'm wrong, but I believe that the origins of these fantastic Japanese stones was a volcanic event, so it would depend on whether the event occurred while the two landmasses were still joined or not. I'm thinking that this occurred after they already separated.
Given that though, Oregon does have some volcanic activity, so it's possible that at some point in the past a volcano in Oregon threw up some similar materials, and they just need to be found and mined...
Anyone from Oregon want to start searching?