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This file contains polygons (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The polygons represent areas of numerous rock units, including, among others, serpentinite/ultramafic rock, Monterey Formation, gabbro, carbonate rock, and Franciscan Complex. Landslide deposits associated with all of these rock units are also shown. Identified as "areas of potential mineralogical concern," these rocks are interpreted to be of particular interest to Caltrans because of their greater potential as sources of mineral hazards. It is important to recognize that if a specific locality falls within a colored area shown on this layer it does not necessarily mean that the locality will have a mineral hazard. Conversely, if a locality falls outside a colored area it does not necessarily mean that locality will not have a mineral hazard. See the individual district reports for further information and details on the rock units as potential sources of mineral hazards. |