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Post by jfox on Oct 29, 2016 8:58:14 GMT -6
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gczop
Full Member
Posts: 202
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Post by gczop on Oct 29, 2016 12:09:01 GMT -6
Jim, Thanks for the link. It's generally accepted that the unique assemblage of minerals were formed during the Grenville orogeny about a billion years ago ( give or take some millions). Gordon
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