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

Gneiss is a metamorphic rock composed of bands and lenses of various minerals, according to Geology.com. "Our candidates for the oldest U.S. rock are ancient gneisses with complex histories.

The oldest rock in the United States has been discovered in Michigan, with zircons dating back 3.82 billion years.

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 ...

An analysis of minerals in the Minnesota gneiss and gneisses from ... they’re really dating minerals. “A rock can be composed of minerals that formed at different ages,” says Frost, of ...

Gneiss is a metamorphic rock composed of bands and lenses of various minerals, according to Geology.com. "Our candidates for the oldest U.S. rock are ancient gneisses with complex histories.

Earth was formed over 4.5 billion years ago ... samples is like searching for a needle in a haystack. The Acasta Gneiss rocks contain a multitude of layers that are sandwiched together, each ...

It formed about 4 billion years ago from ... and older minerals enclosed within other rock formations. But the Acasta Gneiss is the oldest intact piece of Earth’s crust, according to Elizabeth ...

That’s where the Acasta Gneiss comes in. Chowdhury explained last year that it wasn’t until 1999 that scientists confirmed some of the rocks in this formation were more than four billion years ...