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Published October 06, 2011, 12:00 AM

Drilling in the Three Forks oil formation of western N.D.

In this April 26, 2009 photo, a drill rig owned by Enid, Okla.-based Continental Resources Inc. aims for oil from the Three Forks-Sanish formation near Watford City, N.D. Dozens of fruitful wells beneath the rich Bakken shale in North Dakota continue to fuel a hunch among oilmen and geologists that another vast crude-bearing formation may be buried in the state's vast oil patch. (AP Photo/James MacPherson)
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