How Did the Layers of the Grand Canyon Form?
ES2906  Vishnu Schist and Zoroaster Granite

  !   Click the bottom layer of the diagram to see the steps that resulted in the formation of the rocks. Use the movie controls to examine each frame and read the caption text. Move your cursor over the photograph to highlight the Vishnu Schist and the Zoroaster Granite.

Adapted from National Park Service

4. The Zoroaster granite is stratigraphically lower than the Vishnu schist, but it is younger than the schist. Explain how this relationship is possible.


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