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Smithsonian Magazine on MSN5d
The Secrets of How Life Began May Be Hidden Inside the World’s Oldest Rocks
We know Earth is old. Scientists estimate that our planet formed around 4.5 billion years ago. But how old is it exactly? And ...
Michigan lays claim to oldest rocks in US. Where you can find 3.6 billion-year-old stone
Geologists recently dated the age of Watersmeet gneiss, a type of rock in the Upper Peninsula, as the oldest in the U.S. Here ...
Science News26d
The United States’ oldest known rock has existed for at least 3.6 billion years
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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US Has Found Its Oldest Rock at 3.6 Billion Years Old, But Canadians Won’t Be Impressed
A sign beside an outcropping of Minnesota’s Morton Gneiss claims to mark the “World’s Oldest Rock.” However ... The Morton Gneiss was assessed in 1974 as being 3.8 billion years old. The next year The ...
Detroit Free Press6d
Michigan lays claim to oldest rocks in US. Where you can find 3.6 billion-year-old stone
In a recent study, geologists say Michigan is home to the oldest known rock in the nation. Watersmeet gneiss is found in Michigan's Upper Peninsula. Minnesota's Morton gneiss previously held the ...