Geologic map and database of the Roseburg 30 x 60 minute quadrangle, Douglas and Coos Counties, Oregon

Mapping of individual 7.5 minute quadrangles within the Roseburg 30 x 60 minute quadrangle was accomplished by the authors as follows:

 Golden Falls:     Molenaar, Black, Wells (1996)
 Ivers Peak:       Molenaar, Black, Wells, Wheeler (1996)
 Kelly Butte:      Baldwin, unpublished, Wells
 Tyee:             Baldwin, unpublished, Wells
 Tyee Mountain:    Wells, 1994 mapping
 Sutherlin:        Wells, 1994 mapping
 Nonpareil:        Wells, 1994 mapping
 Hinkle Creek:     Wells, 1995 mapping
 Coos Mountain:    Molenaar, Black, Wells (1996)
 Tioga:            Wells, Molenaar and Black (1996)
 Cedar Creek:      Wells, 1995 mapping
 Callahan:         Wells and Smith, 1994 mapping
 Garden Valley:    Felger, Abolins, and Wells (1992)
 Winchester:       Wells, 1992 mapping
 Oak Creek Valley: Wells, 1993 mapping
 Glide:            Wells and Niem, 1995 mapping
 Dora:             Wiley (1995)
 Sitkum:           Wiley (1995)
 Mt. Gurney:       Wiley, Priest and Black (1994)
 Reston:           Black (1990)
 Roseburg West:    Wells, 1990-1991 mapping
 Roseburg East:    Wells, 1990-1991 mapping
 Dixonville:       Jayko and Wells (1999)
 Lane Mountain:    Jayko(1996)
 Remote:           Black (1995)
 Kenyon Mountain:  Black (1994)
 Camas Valley:     Black and Priest (1993)
 Tenmile:          Black (1990)
 Winston:          Jayko (unpublished mapping)
 Myrtle Creek:     Jayko and Gallagher (1997)
 Dodson Butte:     Jayko (1997)
 White Rock:       Jayko (1996)

The databases in this report were compiled in ARC/INFO, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California, with version 3.0 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon, 1991, Wentworth and Fitzgibbon, 1991). The files are in either GRID (ARC/INFO raster data) format or COVERAGE (ARC/ INFO vector data) format. Coverages are stored in uncompressed ARC export format (ARC/INFO version 7.x). ARC/INFO export files (files with the .e00 extension) can be converted into ARC/ INFO coverages in ARC/INFO (see below) and can be read by some other Geographic Information Systems, such as MapInfo via ArcLink and ESRI's ArcView (version 1.0 for Windows 3.1 to 3.11 is available for free from ESRI's web site: http://www.esri.com). The digital compilation was done in version 7.1.1 of ARC/INFO with version 3.0 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon, 1991, Wentworth and Fitzgibbon, 1991). The geologic map information was digitized from stable originals of the geologic maps at 1:24,000 scale. The author manuscripts (pen on mylar and pen on paper) were scanned using a Ideal rasterizing color scanner with a resolution of 600 and 400 dots per inch. The scanned images were vectorized and transformed from scanner coordinates to projection coordinates with digital tics placed by hand at quadrangle corners. The scanned lines were edited interactively by hand using ALACARTE, color boundaries were tagged as appropriate, and scanning artifacts visible at 1:24,000 were removed. The individual digital maps at 1:24,000 were used to create the regional 1:100, 000-scale map in ARC/INFO, and the features that were too small in area or so dense in number and location, were removed from the database to simplify the map.