Geology and coal deposits of the Hymera quadrangle, Sullivan County, Indiana

The Hymera quadrangle is the fourth of a series of quadrangles that are being mapped by the Geological Survey, Indiana Department of Conservation, in cooperation with the United States Geological Survey, as part of a program of study and reappraisal of Indiana coal resources.  The field work was done by the writer, assisted by Harold Hutchinson and Frank E. Kottlowski, during the summer of 1948.  Corrections to the map were mad in the field in the summer of 1950.

The purpose of the mapping is to show in detail the areal geology, the stratigraphy of the Pennsylvanian rocks, the extent and structure of the principal coal beds, the location and extent of mined-out areas, and the coal reserves.  

Outcrops were located on aerial photographs and on the topographic quadrangle map, which was enlarged to a scale of 1:16,000.  Mined areas were plotted from mine maps and strip mine areas.  Information on mines and drill holes was obtained from various published sources, from mine operators, and from records of the Indiana Bureau of Mines and Mining.