I wrote last week about the “Grand Canyon of Colorado” –Unaweep Canyon– but some people could reasonably argue that the grandest canyon in Colorado is really the Black Canyon of the Gunnison. Some states choose their “grand canyons” because they look the most like the Grand Canyon in ...
The width and distinctive shape of the vast gorge of the Colorado River result from how its greatly varied types of rock resist erosion. Harder rocks erode to cliffs. Softer rocks erode to slopes. Various minerals, most containing iron, give Grand Canyon rocks their subtle red, yellow, and g...