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 provided.
References: Marcou & Marcou #678.
Condition: B
Crisply engraved lines. Folding and close trimmed at binders edge, as issued. A couple small spots and light toning along lower folds.