ANNOTATION: This listing includes the depths of all of the coal seams that are located in the area of oil and gas development in southwestern Indiana. These depths are useful for establishing casing depths for seam protection.
Ault, C. H. 1984, Cementing depths to protect coals in southwestern Indiana: Indiana Geological Survey Open-File Study 84-01, 7 p.
Notes: Publications in the Indiana Geological Survey Open-File series have been inconsistently named using a variety of series titles including "Open-File Report," "Open-File Map," and "Open-File Study." Prior to 1994, a publication in this series was generally referred to as an "Open-File Report" (but not always). To help reduce confusion created by these inconsistencies, the IGS now refers to every publication in the Open-File series as an "Open-File Study." To be entirely correct in writing a bibliographic reference for a publication, one should use the series name and number that appears on the publication itself.
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