USGS Scientific Investigations Map 2975Geologic map of the Big Delta B-1 quadrangle, east-central AlaskaBy Warren C. Day, J. Michael O'Neill, John N. Aleinikoff, Gregory N. Green, Richard W. Saltus, and Larry P. GoughThis geospatial database has been approved for release and publication by the Director of the USGS.  Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review.  Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.The database can be downloaded from http://pubs.usgs.gov/sim/2007/2975/.  ArcInfo export files and ArcView shapefiles of each geospatial data set are included in a gzipped tar archive (2975.tar.gz) and a Windows zip archive (2975.zip).  Identical files are included in both compressed archive files.  A georegistered raster image of the topographic base map is included (2975_base.tar.gz, 2975_base.zip).  In addition, an Adobe Portable Document Format (PDF) file may be downloaded, from which a paper copy may be printed.Please refer to the file 2795.met for detailed metadata documentation for this geospatial database.List of files:2795_map.pdf2795_pamphlet_508.pdf2795.met2975_base:  BD1_base.aux  BD1_base.rrd  BD1_base.tfw  BD1_base.tif2975:  00README.TXT  2975.met  e00 directory:    load.aml          an ArcInfo workstation aml to load the database    b1deco.e00        arc coverage containing fault decorations    b1dike.e00        arc coverage containing dikes    b1flt.e00         arc coverage containing faults and thrusts    b1fold.e00        arc coverage containing fold axes    b1geo.e00         polygon coverage containing geologic contacts and units    b1lin.e00         arc coverage containing air-photo determined lineaments    b1mines.e00       point coverage containing known mines and prospects    b1pnt.e00         point coverage containing strike and dip of foliations    b1shrimp.e00      point coverage containing U-Pb SHRIMP age dates    fnt038.e00        ArcInfo font required for geologic symbols    sfo_markers.e00   ArcInfo markerset of geologic symbols    wpgcmyk.e00       a USGS ArcInfo CMYK shadeset    b1color.key       a color text file for the b1 arcplot program    b1line.key        a line text file for the b1 arcplot program    b1pnt.key         a point text file for the b1 arcplot program    b1.aml            an ArcPlot program to create the B1 geologic mapShapefile directory:    b1deco_arc.shp       shapefile containing fault decorations (arcs)    b1deco_polygon.shp   shapefile containing fault decorations (polygons)    b1dike_arc.shp       shapefile containing dikes (arcs)    b1flt_arc.shp        shapefile containing faults and thrusts (arcs)    b1fold_arc.shp       shapefile containing fold axis (arcs)    b1geo_arc.shp        shapefile containing geologic contacts and units (arcs)    b1geo_polygon.shp    shapefile containing geologic contacts and units                            (polygons)    b1lin_arc.shp        shapefile containing airphoto determined lineaments                            (arcs)    b1mines_point.shp    shapefile containing known mines and prospects (points)     b1pnt_point.shp      shapefile containing strike and dip of foliations                            (points)    b1shrimp_point.shp   shapefile containing U-Pb SHRIMP age dates (points)