GRAND CANYON, Ariz. — When I first peered into the layer cake that is the Grand Canyon several years ago, I was surprised to spot a continuous strip of green between a grayish section and a red-brown ...

I love the Grand Canyon, both personally (because of all the good memories I have of my adventures there), and as a scientist. I first saw it in the early summer of 1981 when I went on a six-week-long ...

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 ...

Dams are not just a 20th Century phenomenon in Grand Canyon. As early as 1882, geologists realized that the Colorado River was blocked several times in the past by huge lava dams. They theorized that ...

In 1869, John Wesley Powell was studying layers of rock in the Grand Canyon when he noticed an unconformity in the layers. Around a billion years were missing, and the problem turned out to be global.

Army Maj. Paul Voelke was killed in Afghanistan in 2012. His wife Traci Voelke's and their son Ben Voelke join us to remember him. Also, the Grand Canyon in Arizona is among the world's most amazing ...

The Giles-House copyrighted e-book, “Geology of the Lower Owyhee River, Oregon’s Grand Canyon,” is now online at www.owyheegeology.com as a free downloadable document. An improved second edition will ...

Grand Canyon backcountry permits: https://www.nps.gov/grca/planyourvisit/backcountry-permit.htm U.S. Geologic Survey explanation of Grand Canyon geology: http ...