"Geological Map of a Part of the State of California Explored in 1853 by Lieut. R.S. Williamson U.S. Top. Engr.", Williamson, R. S. (Lt.)

The entire state is shown but only a portion is hand colored to reflect geological knowledge. These regions are color coded in accordance to a legend at the left side of the map. It is a nice early and colorful map of California with a fair amount of geographical detail. Shows many interesting details throughout, and especially along the American River. Lake Tahoe is not shown, rather there is a very small lake named Lake Bonpland. A very fine example of this map that is in remarkable condition.

References: Marcou & Marcou #678.

Condition: A

Folding as issued. Full sheet with wide margins, beautiful color.