DIGITAL DATABASE FOR THE BOSTON QUADRANGLE NK-19, UNITED STATES AND CANADA,
OF THE QUATERNARY GEOLOGIC MAP OF THE UNITED STATES (MISCELLANEOUS 
INVESTIGATIONS SERIES I-1420)

Files available through this site represent the digital component of the 
	Boston Quadrangle of the Quaternary Geologic Atlas of the U.S., 
	Miscellaneous Investigations Series, Map I-1420 (NK-19).  The files 
	consist of .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 ArcInfo aml, keyfiles, 
	shadeset, lineset, and markerset are included to produce the plot of
	the data.  


The following ArcInfo export coverages and other files are included in bostonGIS.zip:

	>geo_net--map unit polygons and open water; lines that are geologic 
			contacts and shorelines.
          
	>gla_lin--a line coverage indicating the outer limits of glacial advance,
                  eskers, minor washboard moraines, and erratic boulder fans.

	>gla_pnt--a point coverage indicating striations, drumlins, and ice-contact 
			marine deltas

	>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_net--a polygon coverage containing county and administrative areas

	>rd_lin--a line coverage of state and federal highways

	>rr_lin--a line coverage of railroads

	>grid_lin--a line coverage of 1 degree projection lines

	>boston.txt--an ASCII file of FGDC formal metadata

        >I-1420_nk-19_plotfile.pdf--A plot of the digital files containing map units, 
			linear and point glacial features, hydrology, topography and list of map symbols

 


Also included in bostonIMG.zip are: 

	I-1420_nk-19_map.pdf--A scan of the original published paper map

	I-1420_nk-19_correlation.pdf--A scan of the chart showing correlation of 
			map units

	I-1420_nk-19_index.pdf--An index map showing location of Quaternary Geologic 
			Atlas of the U.S. quadrangles

	I-1420_nk-19_responsibility.pdf--A scan of the illustration of
            	state compilation responsibilities shown on the paper map

	I-1420_nk-19_lobate.pdf--A scan of the illustration of topographically
      		controlled lobate margins of late Wisconsin Laurentide ice
			sheet in southeastern New England shown on the paper map

	I-1420_nk-19_drift.pdf--A scan of the illustration of distribution of 
			glacial drift on the continental shelf and in the Gulf of Maine
			shown on the paper map

	I-1420_nk-19_textonly.pdf--Text description of map units, figure captions, 
			and sources of information used in preparing the original map

Also available in the file bostonAV.zip are the ArcView shapefiles of the ArcInfo
            	coverages

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