Subsurface Stratigraphy and Oil Fields in the Salem Limestone and Associated Rocks in Indiana

An area of 11 counties in southwestern Indiana was studied because ( 1) the subsurface geology of the Salem Limestone and associated rocks in the area contained numerous correlation discrepancies; (2) it was the locus of recent oil exploration and oil discoveries in these rocks; ( 3) the last subsurface study of this rock section was made in 1957; and ( 4) since that time,subsurface data from newly drilled petroleum- test wells have increased a hundredfold