20200212 14131600 1.0 TRUE Oil Gas Seeps This file contains points (vector format) situated within a study area that encompasses all twelve California Department of Transportation Districts. The points represent locations of oil and natural-gas seeps derived from a statewide database of the U.S. Geological Survey (USGS). Several additional seeps were appended to this database based on field observations by CGS staff. Report by Chris T. Higgins and Ronald K. Churchill.