Description: This layer contains data describing volcanic structures in the state of California obtained by the AASG for the Geothermal Data Project. The data table includes general information on the location of the feature, feature type, a short description and history, and location uncertainty. Information sources are included in the dataset. The FeatureURI for a particular volcanic structure is the cross-referencing link (foreign key) used to associate the feature with web based information on the feature- pictures or other information- specific to one feature. The data is displayed using a circle with a transparent center. Layer files containing the symbology for these data layers can be found in the USGIN repository at http://repository.usgin.org/uri_gin/usgin/dlio/206. The original data and metadata can be viewed or downloaded from the USGIN Repository at http://repository.stategeothermaldata.org/repository/resource/cc54f15894222c91e71e4530dc023b1f/.