The Cambrian-age Tonto Group is a set of rocks famous for holding clues to the burst of new life that reshaped Earth 500 ...

Beneath the Grand Canyon’s iconic layers, scientists have uncovered a fast-paced, 500-million-year-old tale of evolution that ...

The day unfolds with the rhythmic hum of wheels on asphalt as our rented passenger van cruises through northern Arizona toward the Grand Canyon. The landscape transforms gradually as we descend from ...

Since 1963 the Glen Canyon Dam has obstructed the flow of water and accompanying sand into the Grand Canyon via the Colorado River. In response the Glen Canyon Dam Adaptive Management Program ...

A single day at Grand Canyon is well worth your time. This itinerary has the highlights. Park your car and ride the shuttles to the best scenic views and historical locations. Numerous activities ...