Coal Resources Map and Availability for Mining, Villa Grove Quadrangle, Douglas County, Illinois

Computer generated mapIncludes 2 inset maps, an inset cross-section, an inset column, 10 ancillary maps, text, tables, references, index to adjoining 7.5-minute quadrangles, and location mapAncillary maps: Thickness of the Herrin Coal in east-central Illinois -- Thickness of the Springfield Coal -- Depth to top of the Herrin Coal (main bench) -- Thickness of the bedrock above the Herrin Coal (main bench) -- Thickness of the drift above the Herrin Coal -- Ratio of the thickness of bedrock to drift above the Herrin Coal (main bench) -- Stripping ratio of the Herrin Coal (both benches) -- Areas of Herrin Coal overlain by Bankston Fork Limestone -- Availability of the Herrin and Springfield Coals for surface mining -- Availability of the Herrin Coal for underground minin