DIGITAL DATABASE FOR THE QUATERNARY GEOLOGIC MAP OF THE DES MOINES QUADRANGLE,
UNITED STATES, MISCELLANEOUS INVESTIGATIONS SERIES I-1420 (NK-15)

Files available through this site represent the digital component of the
	DES MOINES Quadrangle of the Quaternary Geologic Atlas of the U.S., 
	Miscellaneous Investigations Series, Map I-1420 (NK-15).  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 desmGIS.zip:

	>geo_net--map unit polygons and open water; lines that are geologic
		contacts and shorelines.
          
	>desm_lin--a line coverage of linear features on the map

	>desm_pnt--a point coverage of point features on the map
     
	>hydr_lin--a line coverage indicating locations of streams and water bodies

      >lss_poly--a polygon coverage showing areas of loess overlying the map area

	>topo_lin--a line coverage containing contour lines

	>bnd_lin--a line coverage with a neatline and state boundary lines

	>bnd_poly--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 desmIMG.zip: 

	I-1420_nk-15_map.pdf--A scan of the original published paper map

	I-1420_nk-15_plotfile.pdf--A plot of the digital files
		containing map units, glacial features, hydrology,
            	topography, state boundaries, and list of map symbols

	desm.txt--an ASCII file of FGDC formal metadata

	I-1420_nk-15_correlation.pdf--A scan of the diagram showing
             	correlation of map units

	>I-1420_nk-15_lobes.pdf--A scan of the illustration showing the
		relationship of late Wisconsin advances and stillstands of
		Des Moines lobe, and of Illinoian sublobes of the Lake
		Michigan lobe

	>I-1420_nk-15_loess.pdf--A scan of the illustration showing the
		loess distribution and thickness

	I-1420_nk-15_index.pdf--An index map showing location of
      	Quaternary Geologic Atlas of the U.S. quadrangles

	I-1420_nk-15_responsibility.pdf--A scan of the illustration of
            compilation responsibilities shown on the paper map

	I-1420_nk-25_tillcor.pdf--A scan of the table showing the correlation
		of surface and subsurface pre-Illinoian tills in eastern
		Nebraska and Iowa and possible equivalents  in southeastern\
		Minnesota and southwestern Wisconsin

	I-1420_nk-25_loessstrat.pdf--A scan of the illustration showing 
		loess stratigraphy and thickness on Wisconsin, Illinoian, and
		pre-Illinoian tills
	I-1420_nk-15_textonly.pdf--Text description of map units, figure
	      captions, and sources of information used in preparing the
            original map

Also available in the file desmAV.zip are the ArcView shape files of the
            Arc/Info coverages

  Charles A. Bush
  U.S. Geological Survey                                                     
  (303) 236-4723
  cbush@usgs.gov