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arakish
08-22-2010, 07:32 PM
For those who wish to try and make such a map, here is an excellent (postscript) page with documents explaining and showing geological mapping symbols at the USGS site.

Digital Cartographic Standard for Geologic Map Symbolization (http://pubs.usgs.gov/of/1999/of99-430/)

rmfr

arakish
08-22-2010, 07:36 PM
And here is the FGDC standard.

FGDC Digital Cartographic Standard for Geologic Map Symbolization (http://ngmdb.usgs.gov/fgdc_gds/geolsymstd/download.php)

rmfr