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US Has Found Its Oldest Rock at 3.6 Billion Years Old, But Canadians Won’t Be ImpressedA team of geologists have conducted a survey of likely candidates to identify the oldest rock in the United States. Their ...
A weathered sign in the Minnesota River Valley proudly proclaims: “World’s Oldest Rock.” Erected in 1975, it marks a 3.8-billion-year-old gneiss — or so scientists thought.
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