Colorful map of California covering the entire state, with a portion 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. A huge Mono Lake is depicted. 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. A very handsome map with better than usual hand coloring.

References: Marcou & Marcou #678.

Condition: A

Fine original coloring. The map was issued folding and is now pressed and backed with archival tissue. A couple of light spots, still very good for this issue.