Time, Cratons, and Voyageurs NP
Time, Cratons, and Voyageurs NP
Time, Cratons, and Voyageurs NP
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AGE OF NORTHAMERICANBASEMENTROCKS(Billions Years)Rocks are oldestnear the center ofthe continent(continental shield)<strong>and</strong> tend to beyounger outward.Marshak, EARTH(Norton, 2005)Parks <strong>and</strong> Plates©2005 Robert J. Lillie