Yavapai Observation Station and the Park geology brochure have additional information about all the Grand Canyon rock layers. Trail of Time. Walking Guide.
Grand Canyon National Park National Park Service U.S. Department of the Interior
Walking Guide
Find these markers and find these views along the 2 km (1.2 mile) timeline trail. Each one represents a key time in this region’s geologic history. Yavapai Observation Station and the Park geology brochure have additional information about all the Grand Canyon rock layers.
Canyon Carving last 6 million years
Colorado River
Find the Colorado River deep in the canyon. This mighty river has carved the Grand Canyon in “only” the last six million years.
You are standing on the top rock layer, called the Kaibab Formation. It was deposited 270 million years ago in a shallow sea. From this point you can see lower (older) layers too. The Trail of Time is a joint project of Grand Canyon National Park, the University of New Mexico, and the National Science Foundation
Trail of Time
Grand Canyon National Park National Park Service U.S. Department of the Interior
Walking Guide Lowest Flat Layer
younger layers above
525 million years old older layers below
Tapeats (ta-PEETS) Sandstone
Your best view of the Tapeats Sandstone is from marker 590. But it is actually 525 million years old. It is the oldest of the horizontal rock layers, but not the oldest rock in the canyon.
Supergroup 742 –1,255 million years old
Hakatai (HACK-a-tie) Shale
Find the bright orange Hakatai Shale. It belongs to the Grand Canyon Supergroup. These layers were tilted and partly eroded before the flat layers were deposited on top.
Oldest Rocks 1,660 –1,840 million years old
Basement Rocks
Find the dark Basement Rocks deep in the canyon. They are among the oldest rocks in the Southwest: 1,660 to 1,840 million (1.66 to 1.84 billion) years old.
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