Very striking and graphic stone engraved thematic map that details the geological formations throughout the United States. The nine different geological structures are shown through fine coloring accomplished in free-hand. Locates Eozoic, Silurian, Devonian and Lower Carboniferous, Coal Measures and Permo-Carboniferous, Triassic and Jurassic, Cretaceous, Tertiary, Alluvium, and Volcanic. Includes political boundaries, major cities and watershed.
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Condition: A
Dark impression and bright original color. Hint of toning along centerfold, still very good.