"Geological Map of a part of the State of California Explored in 1853 by Lieut. R.S. Williamson U.S. Top. Engr.", U.S. War Department

Colorful map of California covering the entire state, with a majority hand colored to reflect geological knowledge. These regions are color-coded in accordance with a legend at the left side of the map. The legend gives the locations for nine geological types as mapped by Lieut. R.S. Williamson of the Topographical Engineers. Interesting details throughout, and especially along the American River. Lake Tahoe is not shown, rather in its place is a small lake named Lake Bonpland. Shows a huge Mono Lake. In Southern California, Los Angeles, San Gabriel, San Pedro, and more are located. Prepared to accompany the report of William P. Blake, Geologist of the Expedition. Lithographed by Sarony, Major & Knapp of New York.

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Condition: A

Fine original coloring. Issued folding, now pressed and backed with archival tissue. A couple of light spots, still very good.