A. Geological Map of a Part of the State of California Explored in 1853 by Lieut. R.S. Williamson U.S. Top. Engr. (16.1 x 22.2"). A majority of this map of California is colored to reflect geological knowledge and coded in accordance with a legend at the left. The legend identifies nine geological units as mapped by Lieut. R.S. Williamson of the Topographical Engineers. There are interesting details throughout, and especially along the American River. A huge Mono Lake is shown, but not Lake Tahoe; rather, in its place is a small lake named Lake Bonpland. In Southern California, Los Angeles, San Gabriel and San Pedro are located. Interestingly, the water between San Pedro (Long Beach) and San Diego is called "Earthquake Bay." Condition: Issued folding with light scattered foxing and a short edge tear at left that just passes the neatline and has been closed on verso with archival material. (B+)

B. Geological Map of the Tejon Pass & Canada de las Uvas and the Vicinity. Including the Pass of San Francisquito & Williamsons Pass (9.3 x 6.3"). Map shows the region to the east of Santa Barbara. Identifies five different geologic types including granite, limestone and sandstone. Condition: (A)

C. Geological Map of the Vicinity of San Francisco, Prepared in Office of P.R.R. Exp. & Surveys (9.3 x 6.3"). Depicts the entire San Francisco Bay area and is color-coded for six different geologic types including trap, sand and San Francisco sandstone. Names the Presidio, Mission and Alcatraz. The coastline was based upon charts from the U.S. Coast Survey. Condition: (A)

References: Marcou & Marcou #671, #678 and #679.

Condition:

See description above.