I work a lot with USGS geologic maps and always have the same problem. I am able to download the files from the website (in .e00 format), and make a nice shapefiles out of them. My problem is that there are no .lyr files with symbology, and assigning colors to polygons manually takes ages. The USGS have always great databases and metadata, so it is hard to believe that they wouldn't attach any file which would help with coloring polygons... Does anybody know by chance if there is any symbology "hidden" in files like .e00, .ps, .aml, .met? The database goes with those and I am not sure what are they for...
My data: http://geo-nsdi.er.usgs.gov/metadata/map-mf/2337/metadata.faq.html
The map looks like this: http://pubs.usgs.gov/mf/2000/2337/mf2337f.pdf