Research Guides: Geology: Maps

Map Reading

North Bay Digital Maps include digital geologic and topo maps for Sonoma, Lake, Mendocino, Napa, Marin and Solano Counties.

Historical Atlas Map Of Sonoma County, California, 1877

Digital Sanborn Maps, 1867-1970. California This link opens in a new window
Fire insurance maps of California produced by the Sanborn Map Company from the mid-1880s to around 1970. Digital collection is searchable by city and date.

Historical Topo Maps
Searchable USGS topo maps. See how an area has changed over time. Example is for Cotati Quadrangle.
North Bay Regional Topographic Maps
Print topo maps for the North Bay region.
North Bay Regional Collection: Geology, Geography & Maps
North Bay regional maps, including earthquake, flood, and other hazard maps.
Sonoma County Library Map Collection
Extensive collection of historic Sonoma County maps.
Southern Pomo & Coast Miwok village sites