Title II Geologic Data Compilation Project: Ukiah, Santa Rosa

​​​Geology and Landslides in Selected North Coast Quadrangles
of Northern California​​

Description of Digital Contents​​
This data set contains PDFs of the scanned versions of both the paper and mylar copies of the 1:62,500 and 1:24,000 scale quadrangles mapped under the California Department of Forestry’s Title II Geologic Data Compilation Project of 1979 (Figures 1-4).
In 1979, the California Department of Forestry (CDF), now the California Department of Forestry and Fire Protection (CalFIRE), hired several geologists to compile existing geologic and landslide data on timberlands al​ong California’s north coast. Work was completed under the direction of the California Division of Mines and Geology (CDMG), now the California Geological Survey (CGS). The project, known as the Title II Geologic Data Compilation Project, encompassed more than 70 topographic quadrangles from Del Norte County south to Santa Cruz County (Figures 1-4). Geologic and ​landslide data were compiled at a scale of either 1:62,500 (north of San Francisco) or 1:24,000 (south of San Francisco). The purpose of the compilation was to assist CDF with the identification of non-point sources of sediment pollution from landslides along watercourses within proposed Timber Harvesting Plans. Although data was preliminary in some areas and mapped inconsistently, the maps provided a broad-scale overview of where certain types of geologic terrain might present slope stability and/or erosion problems that should be addressed on the ground. More recent and more detailed mapping has been done in many of the quadrangles originally covered in the Title II Compilation. However, in some remote places, these maps are still the only geologic information available. For additional information on this project, please see the CGS OFR 79-18 project report​. For additional information on data quality and limitations, please see the Title II Description of Digital Contents​ documen​​t. ​​​

​ ​Ukiah and Santa Rosa Region Page​​​​​​

​​Click on the Name Below to Jump to That Region​

​Overview Map of the Project Area Showing USGS Quads​​
Simplified Index Map of Topographic Maps of California within each 1:250,000-Scale Map Sheet.       Quadrangles in the Title II Project are highlighted.

       ​​​​​Inde​x Map of 15-Minute Quadrangles in the Compilation of the Ukiah and Santa Rosa Sheets.   

​​​Ukiah and Santa Rosa




​​Albion-Navarro Dow​​nload​ Download
​Boonville Download Download
​Branscomb DownloadDownload
​Calistoga Download​Download
​Calistoga SlidesDownload Download
​Cape Vizcaino DownloadDownload
​Comptche DownloadDownload
​Eden ValleyDownloadDownload
​Fort Bragg DownloadDownload
​​​HealdsburgDownload Download
​​​Healdsburg SlidesDownloadDownload
Hopland Download​Down​load​
​Hull Mountain DownloadDownload
KelseyvilleDownload​​​ Download​​
Kelseyville SlidesNot Available​Download​​​
​Lake PillsburyDownload Download
​Lakeport DownloadDownload
​Laytonville Download Download
​​Leggett Download Download
​​Lower LakeDownload Download
​Lower Lake SlidesDownload Download
Ornbaun Valley
​​Piercy DownloadDownload
Point ArenaDownload​ Download​
​Potter ValleyDownloadDownload
Santa Rosa Download​ Dow​nload​
Santa Rosa Slides Not Available
​​Sebastopol Download​ Download​
Sebastopol​ SlidesDownload​ Download​
​Spyrock DownloadDownload
St. HelenaDownload​ Download​
​Ukiah DownloadDownload
​​Willits DownloadDownload

​​Supplemental Material​



Index to Geologic Mapp​ing​​ Download​ Download​​​​
Description of Units​​Download​Download​
Santa Rosa ​Mosaic I (Geology) Download​Not Available
Santa Rosa ​Mosaic I (Landlides)​ Download​ Not Available
Santa Rosa Mosaic II (Geology)Download​ Not Available
Santa Rosa ​​​
Mosaic II
Download​ Not Available
Santa Rosa Mosaic III (Geology)​​ Dow​nload​ Not Available
Santa Rosa 
​Mosaic III
Download​ Not Available
Index Map Flight 78-064​Download​ Dow​nload