DIGITAL DATABASE FOR THE QUATERNARY GEOLOGIC MAP OF THE DALLAS QUADRANGLE,
UNITED STATES, MISCELLANEOUS INVESTIGATIONS SERIES I-1420 (NI-14)

Files available through this site represent the digital component of the
Dallas Quadrangle of the Quaternary Geologic Atlas of the U.S., 
Miscellaneous Investigations Series, Map I-1420 (NI-14).  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 dallasGIS.zip:

	>geo_net--map unit polygons and open water; lines that are geologic
		contacts and shorelines.

	>geo_pnt--a point coverage of point data shown on the map

	>geo_lin--a line coverage of fault 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 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 dallasIMG.zip: 

	I-1420_ni-14_map.pdf--A scan of the original published paper map

	I-1420_ni-14_plotfile.pdf--Plot of the digital files containing map units,
	  hydrology, topography, and list of map symbols

	I-1420_ni-14_correlation.pdf--Scan of correlation diagram on published
	  paper map.

	I-1420_ni-14_sand.pdf--Scan of illustration of sand and loess distribution
	  and thickness shown on the paper map.

	I-1420_ni-14_index.pdf--Index map showing location of Quaternary
	  Geologic Atlas of the U.S. quadrangles and quadrangles published
	  digitally and as paper maps.

	I-1420_ni-14_responsibility.pdf--A scan of the illustration of State
            	  compilation responsibilities shown on the paper map

	I-1420_ni-14_textonly.pdf--Text description of map units, figure
	  captions, and sources of information used in preparing the
            	  original map
		
Errors noted on I-1420_ni_14_map.pdf

	In DESCRIPTION OF MAP UNITS, zse, CLAYEY SAND AND SANDY CLAY
		DECOMPOSITON, DECOMPOSITON should be spelled DECOMPOSITION

	In SOURCES OF INFORMATION, Wood, W.W., and Ostercamp, W.R., Ostercamp
		should be spelled Osterkamp

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

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