Preliminary quaternary geologic maps of Santa Clara Valley, Santa Clara, Alameda, and San Mateo counties, California: A digital database
This digital map database, which is compiled from previouslyunpublished and open-filed U.S. Geol. Survey reports (Wesling andHelley, 1989), represents the general distribution and identity ofQuaternary deposits in eight 7.5 minute quadrangles in the southernSan Francisco Bay region, California.
San Francisco Bay Region landslide folio part E - Map of debris-flow source areas in the San Francisco Bay region, California
This map identifies the principal areas in the San Francisco Bayregion that are likely to produce debris flows, which are alsocalled "mudslides." Debris flows that occur in the bay region arefast-moving downslope flows of mud that may include rocks,vegetation, and other debris. These flows begin during intenserainfall as shallow landslides on steep slopes. The rapid movementand sudden arrival of debris flows pose a hazard to life andproperty during and immediately following the triggering rainfall.Debris flows in a given storm originate from a number of sourcesscattered throughout steep parts of the landscape, as shown infigure 1 (on map sheet; files sfbr- df.ps, al-df.ps, etc.). Duringsubsequent storms, new debris...
Preliminary geologic map emphasizing bedrock formations in Alameda County, California: A digital database
This Open-File report is a digital geologic map database of the Alameda County, California.
Preliminary geologic map emphasizing bedrock formations in Contra Costa County, California: A digital database
This digital map database, which is compiled from previouslypublished and unpublished sources combined with new mapping,represents the general distribution and identity of bedrock in ContraCosta County, California.