Glossary of CGS Publication Series

  • ​AMM - Aeromagnetic Maps
    Aeromagnetic contours superimposed on RGM color geolog​ic maps.
  • B - Bulletin
    Bulletins address issues of state-wide or regional importance, often in a comprehensive treatment.
  • BGA - Bouguer Gravity contours superimposed on GAM color geologic maps.
  • BGM - Bouguer Gravity contours superimposed on RGM color geologic maps.
  • CD/DVD - Compact Disc/Digital Video Disc
    These discs contain such data as digital files, graphics files and reports, presented in several formats.
  • CGS Notes
    Short one- to four-page summaries of specific subjects which are most requested by the public.
  • CR - County Report
    Mine and mineral resource information for counties.
  • GAM - Geologic Atlas of California
    1:250,000-scale geologic maps that show California geology in time-stratigraphic units. Originally statewide in scope, these maps have a unified legend and color scheme.
  • GDM - Geologic Data Map
    1:750,000-scale maps showing statewide geologic and geohazard information.
  • MS - Map Sheet
    Principally a map with a short text or explanatory legend.
  • OFR - Open-File Report
    May be any coherent report, map, or other information for immediate release.
  • SP - Special Publication
    Special Publications are of more limited scope than Special Reports, for topics such as program plans or results of special activities, or a reprinted portion of an out-of-print publication.
  • SR - Special Report
    Special Reports deal with local topics and are limited in scope or areal extent.
  • PR - Preliminary Report
    Similar to Open-File Reports, but are generally printed in larger quantities and are to be followed by a report which is more comprehensively edited.
  • RGM - Regional Geologic and Geophysical Maps
    1:250,000-scale geologic maps with individually tailored legends. Typically these maps are more detailed than GAM products. Map colors of common units typically do not vary from sheet to sheet, but identical colors may be used for different formations on different sheets.