"The U.S. Geological Survey says a deposit in West Texas is the largest continuous oil and gas deposit ever discovered in the United States.

On Tuesday, the USGS announced that an area known as the Wolfcamp shale contains 20 billion barrels of oil and 16 trillion cubic feet of natural gas.

That is nearly three times more petroleum than the agency found in North Dakota's Bakken shale in 2013."

Rebecca Hersher reports for NPR November 16, 2016. [2]