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 ...

The rock known as Morton gneiss started out as a gray granite, formed about 3.5 billion years ago deep beneath the surface of the Earth. Molten rock cooled slowly, forming grains (granite comes ...

Smithsonian researchers trekked to a remote site in northern Canada to collect four-billion-year-old rock samples that could ...

What we know today as Sabino Canyon was the site of a whole lot of scrunching 25 million years ago. In a geologic nutshell: Two ancient types of rock - 1.4-billion-year-old Oracle granite and 50 ...

With house-size boulders tumbled across its scarred surface and slanted, twisted peaks looming over its iconic namesake trees, Joshua Tree National Park’s preternatural terrain evokes ...

WHEN: After a 5-day climb battling icy weather conditions, Honnold and Findlay successfully summited the granite-gneiss rock face on Tuesday, Aug. 16. WHERE: Sitting at ground zero of the climate ...

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

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 ...