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Glen Canyon NRAGeology of National Parks

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Locality Map

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John Wesley Powell

• Woodcut from the frontispiece of Powell’s book, The Canyons of the Colorado

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Glen Canyon Dam

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Glen Canyon NRA

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Colorado River and Tributaries

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Aerial View of Lake Powell

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Glen Canyon Before the Dam

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Morrison Formation

• Book Cliffs region, Utah

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Stratigraphic Units (Jurassic)

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Cross-bedding in Navajo Sandstone

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Boats in a Marina

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Fecal Coliform Bacteria Counts

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Graffiti