The Canyon's Age Sparks Fierce Scientific Debate Scientists have spent over a century arguing about when the Colorado River first carved through the Colorado Plateau. A diverse set of geologic studies ...

Introducing the Grand Canyon / Stanley S. Beus, Michael Morales -- Precambrian crystalline core / R. S. Babcock -- Grand Canyon Supergroup : Unkar group / J. D. Hendricks, G. M. Stevenson -- Grand ...

Geology of the older precambrian rocks of the upper granite gorge of the Grand Canyon / R.S. Babcock, E.H. Brown, and M.D. Clark -- The younger precambrian rocks of the Grand Canyon / Trevor D. Ford ...

A new study reveals that the impact of the Meteor crater may have caused a landslide that flooded the Grand Canyon 56,000 ...

When it comes to hiking through Arizona, it's hard not to become some kind of geology expert. I've likened it to someone visiting a foreign country who does not speak the language. After a few weeks, ...

The Pinyon Plain Mine sits just six miles from one of America’s most treasured landscapes, the Grand Canyon. This uranium mine operates within the Kaibab National Forest, which forms the green ...

Hike through secret slot canyons, spot endangered California condors, visit sacred Navajo sites, and kayak a stunning 10-mile ...

LOS ANGELES - The awe-inspiring Grand Canyon was probably carved about 70 million years ago, much earlier than thought, and so early that dinosaurs might have roamed near this natural wonder, a ...