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

Learn how the Grand Canyon used to be home to an ancient evolutionary competition that has since left behind a plethora of ...

Rocks gathered along the Colorado River contained evidence of a bustling community of animals in an ancient sea.

Two of Arizona's most famous landmarks may be linked by cosmic violence: the asteroid that gouged out Meteor Crater may have ...