A stunning new discovery in the Grand Canyon is offering scientists an unprecedented glimpse into Earth’s earliest complex ...

A 500 million-year-old fossil with a spider's brain structure suggests that arachnids may have evolved in the oceans.

Researchers have often turned to the Grand Canyon's layers of sedimentary rock to discover pivotal moments in the history of ...

Paleontologists unearthed fossils in the Grand Canyon dating back more than 500 million years that offer a new look into a time when complex life emerged on Earth.