Mysterious driftwood high in Grand Canyon caves hints at the legacy of Arizona’s huge impact crater.

Scientists are learning more about how water moves through the Grand Canyon, and how what happens above ground affects what ...

Marble Canyon is is not only a geographic marvel — a ribbon of red rock carved by time and water — it’s also a timeless space where silent communion with sky and stone make more sense than catching up ...

Rare fossils found along the Colorado River 'give us a fuller picture of what life was like during the Cambrian period,' says an expert.