Oil Investigations in Illinois in 1914: Area South of the Colmar Oil Field, by William C. Morse and Fred H. Kay. The Coolmar Oil Field--a Restudy, by William C. Morse and Fred H. Kay. The Allendale Oil Field, by John L. Rich. Anticlinal Structure in Randolph County, by Stuart Weller. Oil and Gas in Gillespie and Mt. Olive Quadrangles, by Wallace Lee (Google eBook)

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Illinois State Geological Survey, University of Illinois, 1915 - Petroleum - 111 pages
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Page 27 - FIEt.II 1. The structural features that is, folds are small in area and in magnitude. The crests of many of the domes and anticlines are not more than 20 or 30 feet high. Ist.drill hole FIG. 12. Diagram showing conditions governing oil accumulations : A. In oil sands saturated with salt water. B. In oil sands partly saturated. C. In sand containing no salt water. 2. The oil-bearing horizon is extremely variable in thickness and in character. 3. Drilling already done shows that oil and salt...
Page 87 - In an effort to find a lower coal seam sufficiently thick to be profitably mined, a hole was drilled in the bottom of the shaft which passed into oil-bearing sand at a depth of 255 feet below the coal and 682 feet below the surface. The salt water at first threatened to flood the mine, but the hole was successfully plugged, though oil leaked into the mine and was skimmed from the mine water for several years. The oil was a heavy lubricating oil and was associated with salt water and gas.
Page 87 - Company in November. 1879." In an effort to find a lower coal seam sufficiently thick to be profitably mined, a hole was drilled in the bottom of the shaft which passed into oil-bearing sand at a depth of 255 feet below the coal and 682 feet below the surface.

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