The pink sedimentary layers, the limestone left by antediluvian seas, and the river-carved gorge are stunning reminders of our planet’s age. But as Rock Art of the Grand Canyon Region reveals ...

Standing on the canyon rim, it resembles the sun setting as it fades from pink to orange to vermilion ... top portion of the Grand Staircase, a sequence of sedimentary rock layers in northern ...

GRAND CANYON NATIONAL ... photographed the rock with 'Evans 16' spray-painted in black, and a man and woman walking away from it on May 22. The man was wearing a reddish-pink T-shirt and brown ...

Sedona’s iconic Pink Jeep Tours are now hauling Arizona tourists around the state’s most iconic place, the Grand Canyon. Sedona’s iconic Pink Jeep Tours are now hauling Arizona tourists ...

Something dramatic happened about 500 million years ago called the Cambrian "explosion," during which an incredible diversity ...