This attribute allows other workers to assess changes to original map names and if desired reclassify the unit names assigned by Custer and Dixon. Time periods of content information used to create this coverage were published from 1964-1998. The coverages were built and cleaned and checked for node errors with no dangles, incomplete polygons or node errors known. No known overshoots, undershoots, dangles or open polygons are known to exist. Both electronic and visual searches were made for such errors.
All polygons have attributes.
The polygons were modified to make a consistent map. The original map units are shown on the source shape file. All polygons have labels. The geologic maps used were in electronic and paper formats. The electronic maps used were joined together using ArcEdit.