Angus M. Woodbury,
A History of Southern Utah and Its National Parks…
“ Zion Canyon had already been carved half-a-mile deep in the brilliant Navajo sandstone and most of its geological history had passed long before the eyes of man beheld its glory. One of the world’s rare beauty spots, lying within Zion National Park in southwestern Utah, it serves as a striking example of the thousands of flaming gorges or red box canyons eroded through millions of years on the edges of the plateaus along the Colorado River in southern Utah and northern Arizona. ”
