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).

It’s called the Monterey Canyon, and its submarine majesty rivals even that of the Grand Canyon ... “MBARI’s Low-Altitude Survey System maps seafloor environments at the scale of the ...

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 ...