In the past few years the Petroleum Exploration Company of Lexington, Kentucky, has undertaken the drilling of a series of core holes in the old Irvine field as a necessary preliminary step in its program of repressuring. It has made possible some study of the unexposed limestone section underlying the Ohio shale (including probably the Olentangy) and the identification of these producing beds which are unknown in outcrop on the east side of the Cincinnati arch in Kentucky.
In the outcrop near Irvine, 7–20 feet of the Boyle limestone intervene between the Ohio shale and the Crab Orchard series. Eastward...
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