Geologists recently dated the age of Watersmeet gneiss, a type of rock in the Upper Peninsula, as the oldest in the U.S. Here ...

We can add another Michigan discovery to the list related to the oldest rock in America! That's right, this particular rock ...

For years, Minnesota’s Morton Gneiss was celebrated as the world’s oldest rock, with claims dating back to 3.8 billion years. A sign near its outcrop in Granite Falls, Minnesota, proudly declared it ...

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 ...