At only 5,000 years of age, the Everglades is a young region in geological terms.

It's a geological term rather than a geographical one.

The neocortex had been, in geological terms, a hasty development.

I don't think people really understand how fast the environment has changed in geological terms.

Country rock is a geological term meaning the rock native to an area.

The Andes are a young range in geological terms, and volcanic activity is still present.

Even the landscape itself is relatively new, in geological terms.

It is a relatively new landmass in geological terms, having risen from the sea about 4,000 years ago.

The Hudson is sometimes called, in geological terms, a drowned river.

In geological terms, I learned later, an aeon is indeed a billion years.