Time, Cratons, and Voyageurs NP
Time, Cratons, and Voyageurs NP
Time, Cratons, and Voyageurs NP
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Cosmogenic (surface) dating: If a rock surface was initially exposed to the air during anevent of interest (such as this glacially-scoured surface), then the amount of damage tothe surface from incoming high-energy radiation (cosmic rays) will indicate how long agothe exposure occurred, thereby dating the event (in this case, glaciation).