How Oil Made North Dakota Rich, in One Map

An oil drilling rig is seen September 29, 2010 near Stanley, North Dakota. The well is being drilled into the Bakken Formation, one of the largest contiguous deposits of oil and natural gas in the United States. It is an interbedded sequence of black shale, siltstone and sandstone that underlies large areas of northwestern North Dakota, northeastern Montana, southern Saskatchewan and southwestern Manitoba.
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