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Date: 2007-12-12 16:50:55Cratons Geology of North America Orogeny Superior craton Zircon Precambrian Grenville orogeny Fond du Lac Wisconsin Fond du Lac Geology Historical geology Proterozoic | Add to Reading ListSource URL: keckgeology.orgDownload Document from Source WebsiteFile Size: 559,94 KBShare Document on Facebook |