Version history for


  Brabb, Earl E., and Parker, John M., 2003, Location and 
       age of foraminifer samples collected by Chevron 
       petroleum geologists in California:  U.S. Geological 
       Survey Open File Report 03-167, version 2.0.  
       [available on the World Wide Web at 
       http://pubs.usgs.gov/of/2003/of03-167/ ].


  Version 2.0

  May 13, 2005

  Migrated to new Web server at
  http://pubs.usgs.gov/of/2003/of03-167/

  April 15, 2005

  Revisions: 

  Added John Parker as coauthor

  Databases #1 and #2 were prepared primarily to assist the 
  California Academy of Sciences in curating thousands of 
  slides containing foraminifers. Hundreds of samples that 
  have no slides but do have a Chevron age have been added 
  in the revision. Barren and non-diagnostic samples and 
  samples without paleontologic data have been moved from # 
  1 and # 2 and put in database # 3. Database # 2 is simply 
  # 1 sorted to provide a way to locate numbers by 
  quadrangle. The age of all samples has been revised to be 
  more in accordance with the North American Stratigraphic 
  Code and more modern correlations. Many Chevron ages from 
  nannoplankton and some from mollusks, diatoms, pollen, 
  and other fossils have been added. The location and age 
  of samples with an obsolete numbering system and from 
  obsolete quadrangles, formerly in database # 5, have been 
  moved into #1 and # 2. 

  Database # 3 now provides information for every Chevron 
  locality number in every quadrangle. This database was 
  used extensively to find slides and paleontologic reports 
  that have no locality data. Note that any number might be 
  found in as many as four quadrangles because Chevron labs 
  in different districts used the same (and therefore 
  duplicate) numbering system. Note also that all sub-lot 
  numbers have been eliminated in order to reduce the size 
  and increase the usefulness of the database.

  Database # 4 was changed to show the number of localities 
  in a quadrangle if no slides had been prepared. Several 
  errors were corrected and a few quadrangles were added to 
  bring the total to 616.

  Database # 5 now provides mainly data for the porosity, 
  permeability, density, and magnetic susceptibility of 750 
  samples. A few potassium-argon dates are also included. 


  Version 1.0, June 26, 2003

  Intital release online at
  http://geopubs.wr.usgs.gov/open-file/of03-167/