A two billion year window into the earth

Researchers were amazed to find two billion year old unaltered rocks on the ocean floor. The rocks' age was precisely confirmed due to presence of isotopes of osmium.

"I just about fell off my chair. We can't exaggerate how important these rocks are -- they're a window into that deep part of earth."

The picture is of a section of these rocks.

Filed under: earth, rocks, ancient, and two billion years