A treasure trove of exceptionally preserved early animals from more than half a billion years ago has been discovered in the ...

A remarkable coincidence occurred 56,000 years ago, when the impact that created Meteor Crater triggered both a landslide-dammed lake and a paleolake formation in the Grand Canyon. Earth’s ancient ...

Hells Canyon might be deeper than the Grand Canyon, but it's barely 2 million years old, according to a new study. ... Scientists make major discovery about America's deepest canyon.