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The Sea Retreats, The Sea Returns

The sea retreats, the sea returns

The sea retreats, the sea returns

  • Exhibition Text

    • The upper walls of the Grand Canyon reveal sedimentary rock layers formed in marine and continental environments between 550 and 260 million years ago. The Coconino Sandstone layers were deposited by winds in dry periods. As the sea returned, the rock layers of the Toroweap Sandstone were created in sandy coastal environments. Finally, as the ocean encroached, the Kaibab Limestone was deposited in quiet, shallow waters.

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In This Section

Windblown Desert Deposit

Windblown Desert Deposit

The Coconino Sanstone was formed when desert winds drove fine grains of quartz sands onto the Colorado Plateau, dune by dune.

Calm Marine Deposit Specimen 1

Calm marine deposit

The Kaibab Limestone was deposited as organic carbonate fossil fragments, sand grains, and mud 260 million years ago in a shallow, quiet ocean.

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