|
|
Explanation of Springfield Map
The map accompanying this directory shows the location of coal mines known to
be present in the quadrangle. The map, corresponding to
a USGS 7.5-minute quadrangle, covers an area
bounded by lines of latitude and longitude 7.5-minutes apart. In Illinois, a
quadrangle is approximately 6.5 miles east to west and 8.5 miles north to south,
an area of about 56 square miles. The locations of roads and water bodies on
the map were obtained from USGS digital line graph files. The ISGS
generally offers one map of mines per quadrangle. In some areas, however, extensive
mining occurred in two or more overlapping seams. Separate
maps are compiled for mines in each seam to maintain the readability of the
map for these areas.
Map Interpretation Guide
The guide to interpreting the map is divided into 3 main sections:
- Mine Type and Mining Method
- Source Maps
- Points and Labels
|
|
|
Land Reclamation Division
|
|
Administrative Rulings: 
