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 ...

Learn more about the nectocaridid, an ancient marine creature that looks like a squid but actually belongs to a family of ...

Soft-bodied Cambrian fossils found in the Grand Canyon reveals how early animals evolved complex feeding systems over 500 ...

A mysterious and strange discovery in heart of the Grand Canyon, Arizona has revealed new clues that could reshape our ...

A mysterious and strange discovery in heart of the Grand Canyon, Arizona has revealed new clues that could reshape our ...

Paleontologists unearthed fossils in the Grand Canyon dating back more than 500 million years that offer a new look into a ...

A long-misidentified fossil, once thought to be a caterpillar, has revealed itself as a groundbreaking discovery in early animal evolution.

University of Arizona researchers reviewed an "exquisitely preserved" fossil of Mollisonia symmetrica that supports the idea ...

A fossilized brain from a 500-million-year-old sea creature shows unexpected spider-like features, hinting that spiders and their kin may have evolved in the ocean—not on land.