(1) vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, loess thickness contours, cross-section line locations, and data points for stratigraphic test holes, outcrops, ISGS field notes, water wells, and engineering borings;
(2) JPEG thumbnail images of the final published map;
(3) metadata in FGDC compliant format for all spatial layers;
The vector data include name and modifier for geologic unit, map symbol, a qualitative statement on the relative accuracy of the mapped location of unit boundaries, loess thickness contour values, clay content of the Glasford Formation, the percentage of illite in the clay mineral fraction of the Glasford, magnetic susceptibility, and the soil horizon sampled.
Vector data are in the geographic coordinate system, decimal degrees, NAD83.
For a detailed list of the files included in the data product, see the Supplemental_Information section.
The data were published in 1999 on an ISGS Illinois Geologic Quadrangle entitled Surficial Geology Map, Alton Quadrangle (Illinois Portion) Madison County, Illinois by David Grimley. The data in this compilation do not include all the information on the published map. Refer to the published map for a complete explanation of the Quaternary geology of the Alton quadrangle.
The nominal scale is 1:24,000.
Detailed List Of Files included in the product ---------------------------------------------- Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00001 data_pt.dbf 10 shapefile dBase component data points dp00001 data_pt.prj 1 shapefile projection component data points dp00001 data_pt.shp 4 shapefile data points dp00001 data_pt.shx 2 shapefile component data points dp00001 loess_ln.dbf 1 shapefile dBase component loess contours dp00001 loess_ln.prj 1 shapefile projection component loess contours dp00001 loess_ln.shp 4 shapefile loess contours dp00001 loess_ln.shx 1 shapefile component loess contours Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00001 qtgeo_ln.dbf 6 shapefile dBase component geologic contacts - map boundaries dp00001 qtgeo_ln.prj 1 shapefile projection component geologic contacts - map boundaries dp00001 qtgeo_ln.shp 333 shapefile geologic contacts - map boundaries dp00001 qtgeo_ln.shx 4 shapefile component geologic contacts - map boundaries dp00001 qtgeo_py.dbf 26 shapefile dBase component geologic units dp00001 qtgeo_py.prj 1 shapefile projection component geologic units dp00001 qtgeo_py.shp 624 shapefile geologic units dp00001 qtgeo_py.shx 2 shapefile component geologic units dp00001 readme.htm 18 ASCII text imbedded in HTML describes this data bundle dp00001 xs_ln.dbf 1 shapefile dBase component cross-section location and designation dp00001 xs_ln.prj 1 shapefile projection component cross-section location and designation dp00001 xs_ln.shp 1 shapefile cross-section location and designation dp00001 xs_ln.shx 1 shapefile component cross-section location and designation Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00001/images browse_l.jpg 356 JPEG/JFIF image large browse graphic dp00001/images browse_m.jpg 325 JPEG/JFIF image reduced resolution image of the mapped quad as it appears on the published map dp00001/images browse_s.jpg 10 JPEG/JFIF image small browse graphic dp00001/images locmap.jpg 47 JPEG/JFIF image location map from published map Folder Filename Size(kb) Filetype Description ----------------- -------------- -------- --------------------------------------------- ------------------------------------------------------------- dp00001/metadata data_pt.htm 20 metadata in FGDC HTML outline format data point metadata dp00001/metadata loess.htm 16 metadata in FGDC HTML outline format loess contour metadata dp00001/metadata dp00001.htm 20 metadata in FGDC HTML outline format overall metadata document to describe this data bundle dp00001/metadata dp00001f.htm 19 metadata in FGDC HTML FAQ format overall metadata document to describe this data bundle dp00001/metadata qtgeo.htm 18 metadata in FGDC HTML outline format geological units and contacts metadata dp00001/metadata qtgeotif.htm 16 metadata in FGDC HTML outline format metadata for GeoTIFF of mapped quad from published map dp00001/metadata xs_ln.htm 16 metadata in FGDC HTML outline format cross-section line metadata
Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR.
These data are not to be used for commercial profit.
These data should not be used at scales greater than 1:24,000.
In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR.
It is assumed that those who wish to download, unzip and use these data are technically proficient in using the Internet, file zipping software, and GIS software. The ISGS will entertain questions about the data, but will not provide support of any kind in regard to the use of the Internet or any particular software package.