The Cambrian-age Tonto Group is a set of rocks famous for holding clues to the burst of new life that reshaped Earth 500 ...

This one-day itinerary includes the best of Grand Canyon's South Rim, including El Tovar, Mather Point, Bright Angel Trail and Desert View Watchtower.

Starting just west of the Yavapai Geology museum on the canyon rim, visitors can walk backward in time from today toward the oldest rock in Grand Canyon, Elves Chasm gneiss (1,840 million years old).

Grand Canyon Lodge (1937) balances on the very edge of the chasm, and its back patio offers perhaps the best place in the entire park to sit, stare, and contemplate the geological wonder that ...

The Grand Canyon has a long and beautiful geological history, and it’s showcased along the Trail of Time, which runs almost three miles round-trip along the canyon rim between the Yavapai Museum ...

The Grand Canyon, a Cathedral to Time ... uneasy duality — that changed nearly everything for the canyon — feels almost small compared with all the geologic upheavals that took place before ...