Very detailed and strongly colored geological map from the U.S. Geological Surveys. Covers the region from Prescott (Ft. Whipple) and Camp Verde north through the Grand Canyon and Marble Canyon, today's Canyonlands National Park, Moab, and the southern portion of the Great Salt Lake. Locates the Wasatch and Uintah Mountains, the Bad Land Cliffs (Book Cliffs), the San Juan River, etc. Remarkable detail of watershed and topography. This thematic map identifies ten geological formations through color including: Tertiary, Cretaceous, Jurassic, Trias, Permian, Carboniferous, Silurian, Archaean, Trachyte Rhyolite & Andesite, and Basalt. Engraved by J.H. Renshawe. A very colorful and handsome map.

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Condition: A

Brilliant color, strong impression and full margins. Small area of light water stain at one fold intersection and two small splits at fold intersections, still very good. Folding, as issued.