As such, it contains some of the oldest known rocks and microfossils in the world.

It is the oldest known exposed rock in the world.

Except for recent alluvial deposits, there are no other known Cenozoic rocks.

The formation had been dated by radioactive decay techniques at 3.85 billion years old, the oldest known rocks in the world.

In general, the material in the diamond pipes is from depths far greater than any other known volcanic rock.

Numen has become one of the most known progressive rock in Spain of the 90's.

The rock, it turned out, was formed 4.5 billion years ago, making it the oldest known rock from any planet.

There are no known Jurassic rocks at the surface of North Carolina.

Siluria: The history of the oldest known rocks containing organic remains.

Some of these are the lightest known rocks in the world, with apparent densities of only 0-3.