How Did the Layers of the Grand Canyon Form?
ES2906  Kaibab Limestone

The Kaibab Limestone forms the rim of the Grand Canyon. No younger layers appear above it in this region.

  !   Click the Kaibab Limestone in the diagram to see a photograph and information about the layer.

12. Hypothesize about why there are no layers younger than 225 million years old in the Grand Canyon area.

Adapted from National Park Service

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