Geologic Map Data Model 5/19/98 Forward: Version 4.2 1 DRAFT - DRAFT – DRAFT DIGITAL GEOLOGIC MAP DATA MODEL Version 4.2 May 19, 1998 By Bruce R. Johnson, Boyan Brodaric, and Gary L. Raines AASG/USGS Geologic Map Data Model Working Group* Gary Raines 1 , Chairman, US Geological Survey, graines@usgs.gov Boyan Brodaric 1 , Geological Survey of Canada, brodaric@gsc.nrcan.gc.ca Jim Cobb, Kentucky Geological Survey, cobb@kgs.mm.uky.edu Ralph Haugerud, US Geological Survey, rhaugerud@usgs.gov Greg Hermann, New Jersey Geological Survey, gregh@njgs.dep.state.nj.us Bruce Johnson 1 , US Geological Survey, bjohnson@usgs.gov Jim McDonald, Ohio Geological Survey, jim.mcdonald@dnr.state.oh.us Don Mckay, Illinois Geological Survey, mckay@glacier.isgs.uiuc.edu Steve P Schilling, US Geological Survey, sschilli@usgs.gov Randy Schumann, US Geological Survey, rschumann@usgs.gov Bill Shilts, Illinois Geological Survey, shilts@geoserv.isgs.uiuc.edu Ron Wahl, US Geological Survey, rwahl@usgs.gov * Names listed in alphabetical order after the chairman 1 Contacts for detailed questions about this report Current version of this report is available at: http://ncgmp.usgs.gov/ngmdbproject