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

Wyoming geologist Carol Frost and three of her colleagues have identified a new oldest rock in America. Found in Michigan, ...

The Morton gneiss rock in Minnesota was previously known to be the oldest rock in the U.S. at more than 3.8 billion years old, ScienceNews reported. However, the new analysis dates the rock to ...

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.

Geologist Michael Ackerson holds a sample from Canada's Acasta Gneiss formation, home to some of the oldest rocks on the planet. Michael Ackerson We know Earth is old. Scientists estimate that our ...

This crag, an eye-catching expanse of gneiss rock near Tram Stop 1, makes a perch for saguaros. Cracks in the cliff face are geologic features known as joints. Dean Knuth/Arizona Daily Star ...

Yellow Aster Gneiss. Season 5 Episode 7 | 5m 41s Video has Closed Captions | CC. Oldest North Cascades bedrock, a 400-million-year-old tale from European origins. Aired 01/18/2024 | Expires 12/06/2025 ...

Although the Acasta Gneiss is known to contain the oldest rocks on Earth, finding the 4-billion-year-old samples is like searching for a needle in a haystack.

The rocks on Barra formed in the Archaean Eon more than 2.7 billion years ago. “When we got close to the rocks in the quarry, we could see their banding was typical of Lewisian gneiss,” says Paul.