Very striking and graphic engraved map that details the geological composition the United States. The nine different geological types are shown in different hand color. Locates Eozoic, Silurian, Devonian and Lower Carboniferous, Coal Measures and Permo-Carboniferous, Triassic and Jurassic, Cretaceous, Tertiary, Alluvium, and Volcanic. Includes state boundaries, major cities and watershed. The map is based on Hitchcock’s map for the American Institute of Mining and was published by O.W. Gray and Son of Philadelphia. On verso are zoological and botanical maps of the United States, as well as a series of 5 maps showing the progression of the United States from the Revolutionary War to the 1880s.
A nice example with light toning and a few minor creases at top right, outside of the image.