GRAND CANYON GEOLOGY: Rock Layers and Stratigraphy

Grand Canyon Age

Last Updated: Dec 29, 2018

Grand Canyon Geology: Rock Superposition

Grand Canyon Layers

Rocks tell us about colliding continents, meandering streams and volcanic eruptions. In the case of the Grand Canyon, the multi-layered strata provide insight to the age of the Earth.

Like a stack of pancakes, younger rock layers pile on top of older layers. We use the law of superposition to reveal Earth’s age.

For example, the base of the Grand Canyon are Precambrian basement rocks. These were formed from flowing magma which cooled and hardened about 1.8 billion years ago.

Most of the rocks on top are sedimentary like shale, limestone and sandstone.

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