http://pubs.usgs.gov/of/2011/1225/ABGeo_readme.txt


  Description of digital dataset files posted on this 
  website:

  ABGeo_metadata.txt - FGDC compliant upper level metadata.
  Feature dataset, and feature classes also have their own
  metadata.

  ABGeo_readme.txt - this file

  AlluvialBasinsGeology_db.zip - zipped package of files
  necessary to create an ArcMap Personal Geodatabase
  project.
      -- ABGeo_Map.mxd
      -- AlluvialBasinsGeology.mdb.zip - Personal
           geodatabase
      -- AlluvialBasinsGeology.style - ArcMap style for
           symbolizing data
      -- readme_abgeo_db.txt


  AlluvialBasinsGeology_shape.zip - zipped package of
  feature classes converted to shapefiles to facilitate use
  of the data in ArcMap and other applications.
      -- AlluvialBasinsGeology.style - ArcMap style for
           symbolizing data
      -- readme_abgeo_shape.txt
      -- Shapefiles include:
        -- abglg_arc.shp - geologic contacts and faults
        -- abatd_pt.shp - bedding, foliation
        -- abfold_arc.shp - fold axes
        -- abglg_poly.shp - geologic unit polygons
        -- abglg_pt.shp - geologic unit points