Grand Canyon: Top Photos

Two billion years of Earth's history cut open by a river

Fossil: Crinoid columnal - upper Kaibab limestone, 40 ft. below the canyon rim. Though plant-like in appearance, crinoids, or sea lilies, were animals, sometimes described as seastars on a stick. They
Fossil: Crinoid columnal - upper Kaibab limestone, 40 ft. below the canyon rim. Though plant-like in appearance, crinoids, or sea lilies, were animals, sometimes described as seastars on a stick.… © Grand Canyon National Park, CC BY 2.0, via Wikimedia Commons

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