USGS: Montana-Dakota may hold 3.7 bln bbl oil -

A shale rock formation that stretches across Montana and North Dakota could hold about 3.7 billion barrels of oil, the biggest single deposit in the United States except for Alaska, the U.S. Geological Survey said this week.

The area could also hold 1.85 trillion cubic feet of natural gas and 148 million barrels of natural gas liquids, the USGS said.

The Arctic National Wildlife Refuge (ANWR) in Alaska could hold more than 10 billion barrels of oil. But ANWR is off-limits due to a congressional drilling moratorium...

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