DIGITAL DATABASE FOR THE QUATERNARY GEOLOGIC MAP OF THE LAKE NIPIGON QUADRANGLE, UNITED STATES AND CANADA, MISCELLANEOUS INVESTIGATIONS SERIES I-1420 (NM-16) Files available through this site represent the digital component of the Lake Nipigon Quadrangle of the Quaternary Geologic Atlas of the U.S., Miscellaneous Investigations Series Map I-1420 (NM-16). The files contain .e00 files, shapefiles, and pdf files of the map's illustrations and correlation diagram, and pdf files of the map unit descriptions and sources of information. An ARC/INFO aml, keyfiles and shadeset are included to produce the plot of the data. The following ARC/INFO export coverages are included in nipigonGIS.zip: >geo_net--map unit polygons and open water; lines that are geologic contacts and shorelines. >gla_lin--a line coverage of linear features >gla_pnt--a point coverage of point data shown on the map >hydr_lin--a line coverage indicating locations of streams and water bodies >topo_lin--a line coverage containing contour lines >bnd_lin--a line coverage with a neatline and state and U.S. boundary lines >bnd_net--a polygon coverage containing county and administrative areas >rd_lin--a line coverage of state and federal highways in the U.S. >rr_lin--a line coverage of railroads >grid_lin--a line coverage of 1 degree projection lines Included in nipigonIMG.zip: I-1420_nm-16_map.pdf--A scan of the original published paper map nipigon.txt--an ASCII file of FGDC formal metadata I-1420_nm-16_correlation.pdf--A scan of the diagram showing correlation of map units >I-1420_nm-16_glacialphase.pdf--A scan of the illustration showing relative ages of glacial phases in the Rainy and Superior lobe areas in the Lake Nipigon map area I-1420_nm-16_index.pdf--An index map showing location of Quaternary Geologic Atlas of the U.S. quadrangles I-1420_nm-16_responsibility.pdf--A scan of the illustration of compilation responsibilities shown on the paper map textonly.doc--Text description of map units, figure captions, and sources of information used in preparing the original map I-1420_nm-16_agecontrols--A scan of the illustration of radiocarbon- age controls of culmination of a regional glacial readvance (Phase 3) approximately synchronous with the Pleistocene- Holocene boundary Also available in the file nipigonAV.zip are the ArcView shape files of the Arc/Info coverages Charles A. Bush U.S. Geological Survey (303) 236-4723 cbush@usgs.gov