North Dakota and Montana have an estimated 3-4,300,000,000 barrels of undiscovered, technically recoverable oil in an area known as the Bakken Formation.

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North Dakota and Montana have an estimated 3-4,300,000,000 barrels of undiscovered, technically recoverable oil in an area known as the Bakken Formation. A U.S. Geological Survey assessment shows a 25-fold increase in the amount of oil that can be recovered compared to the agency's 1995 estimate of 151,000,000 barrels. New geologic models, advances in drilling...